/** * A simple set of functions to check our version 1.0 update service. * * @package WordPress * @since 2.3.0 */ /** * Check WordPress version against the newest version. * * The WordPress version, PHP version, and Locale is sent. Checks against the * WordPress server at api.wordpress.org server. Will only check if WordPress * isn't installing. * * @since 2.3.0 * @uses $wp_version Used to check against the newest WordPress version. * * @param array $extra_stats Extra statistics to report to the WordPress.org API. * @param bool $force_check Whether to bypass the transient cache and force a fresh update check. Defaults to false, true if $extra_stats is set. * @return mixed Returns null if update is unsupported. Returns false if check is too soon. */ function wp_version_check( $extra_stats = array(), $force_check = false ) { if ( defined('WP_INSTALLING') ) return; global $wpdb, $wp_local_package; include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version $php_version = phpversion(); $current = get_site_transient( 'update_core' ); $translations = wp_get_installed_translations( 'core' ); // Invalidate the transient when $wp_version changes if ( is_object( $current ) && $wp_version != $current->version_checked ) $current = false; if ( ! is_object($current) ) { $current = new stdClass; $current->updates = array(); $current->version_checked = $wp_version; } if ( ! empty( $extra_stats ) ) $force_check = true; // Wait 60 seconds between multiple version check requests $timeout = 60; $time_not_changed = isset( $current->last_checked ) && $timeout > ( time() - $current->last_checked ); if ( ! $force_check && $time_not_changed ) return false; $locale = get_locale(); /** * Filter the locale requested for WordPress core translations. * * @since 2.8.0 * * @param string $locale Current locale. */ $locale = apply_filters( 'core_version_check_locale', $locale ); // Update last_checked for current to prevent multiple blocking requests if request hangs $current->last_checked = time(); set_site_transient( 'update_core', $current ); if ( method_exists( $wpdb, 'db_version' ) ) $mysql_version = preg_replace('/[^0-9.].*/', '', $wpdb->db_version()); else $mysql_version = 'N/A'; if ( is_multisite() ) { $user_count = get_user_count(); $num_blogs = get_blog_count(); $wp_install = network_site_url(); $multisite_enabled = 1; } else { $user_count = count_users(); $user_count = $user_count['total_users']; $multisite_enabled = 0; $num_blogs = 1; $wp_install = home_url( '/' ); } $query = array( 'version' => $wp_version, 'php' => $php_version, 'locale' => $locale, 'mysql' => $mysql_version, 'local_package' => isset( $wp_local_package ) ? $wp_local_package : '', 'blogs' => $num_blogs, 'users' => $user_count, 'multisite_enabled' => $multisite_enabled, ); $post_body = array( 'translations' => json_encode( $translations ), ); if ( is_array( $extra_stats ) ) $post_body = array_merge( $post_body, $extra_stats ); $url = $http_url = 'http://api.wordpress.org/core/version-check/1.7/?' . http_build_query( $query, null, '&' ); if ( $ssl = wp_http_supports( array( 'ssl' ) ) ) $url = set_url_scheme( $url, 'https' ); $options = array( 'timeout' => ( ( defined('DOING_CRON') && DOING_CRON ) ? 30 : 3 ), 'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ), 'headers' => array( 'wp_install' => $wp_install, 'wp_blog' => home_url( '/' ) ), 'body' => $post_body, ); $response = wp_remote_post( $url, $options ); if ( $ssl && is_wp_error( $response ) ) { trigger_error( __( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server’s configuration. If you continue to have problems, please try the support forums.' ) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ), headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE ); $response = wp_remote_post( $http_url, $options ); } if ( is_wp_error( $response ) || 200 != wp_remote_retrieve_response_code( $response ) ) return false; $body = trim( wp_remote_retrieve_body( $response ) ); $body = json_decode( $body, true ); if ( ! is_array( $body ) || ! isset( $body['offers'] ) ) return false; $offers = $body['offers']; foreach ( $offers as &$offer ) { foreach ( $offer as $offer_key => $value ) { if ( 'packages' == $offer_key ) $offer['packages'] = (object) array_intersect_key( array_map( 'esc_url', $offer['packages'] ), array_fill_keys( array( 'full', 'no_content', 'new_bundled', 'partial', 'rollback' ), '' ) ); elseif ( 'download' == $offer_key ) $offer['download'] = esc_url( $value ); else $offer[ $offer_key ] = esc_html( $value ); } $offer = (object) array_intersect_key( $offer, array_fill_keys( array( 'response', 'download', 'locale', 'packages', 'current', 'version', 'php_version', 'mysql_version', 'new_bundled', 'partial_version', 'notify_email', 'support_email' ), '' ) ); } $updates = new stdClass(); $updates->updates = $offers; $updates->last_checked = time(); $updates->version_checked = $wp_version; if ( isset( $body['translations'] ) ) $updates->translations = $body['translations']; set_site_transient( 'update_core', $updates ); if ( ! empty( $body['ttl'] ) ) { $ttl = (int) $body['ttl']; if ( $ttl && ( time() + $ttl < wp_next_scheduled( 'wp_version_check' ) ) ) { // Queue an event to re-run the update check in $ttl seconds. wp_schedule_single_event( time() + $ttl, 'wp_version_check' ); } } // Trigger a background updates check if running non-interactively, and we weren't called from the update handler. if ( defined( 'DOING_CRON' ) && DOING_CRON && ! doing_action( 'wp_maybe_auto_update' ) ) { do_action( 'wp_maybe_auto_update' ); } } /** * Check plugin versions against the latest versions hosted on WordPress.org. * * The WordPress version, PHP version, and Locale is sent along with a list of * all plugins installed. Checks against the WordPress server at * api.wordpress.org. Will only check if WordPress isn't installing. * * @since 2.3.0 * @uses $wp_version Used to notify the WordPress version. * * @param array $extra_stats Extra statistics to report to the WordPress.org API. * @return mixed Returns null if update is unsupported. Returns false if check is too soon. */ function wp_update_plugins( $extra_stats = array() ) { include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version if ( defined('WP_INSTALLING') ) return false; // If running blog-side, bail unless we've not checked in the last 12 hours if ( !function_exists( 'get_plugins' ) ) require_once( ABSPATH . 'wp-admin/includes/plugin.php' ); $plugins = get_plugins(); $translations = wp_get_installed_translations( 'plugins' ); $active = get_option( 'active_plugins', array() ); $current = get_site_transient( 'update_plugins' ); if ( ! is_object($current) ) $current = new stdClass; $new_option = new stdClass; $new_option->last_checked = time(); // Check for update on a different schedule, depending on the page. switch ( current_filter() ) { case 'upgrader_process_complete' : $timeout = 0; break; case 'load-update-core.php' : $timeout = MINUTE_IN_SECONDS; break; case 'load-plugins.php' : case 'load-update.php' : $timeout = HOUR_IN_SECONDS; break; default : if ( defined( 'DOING_CRON' ) && DOING_CRON ) { $timeout = 0; } else { $timeout = 12 * HOUR_IN_SECONDS; } } $time_not_changed = isset( $current->last_checked ) && $timeout > ( time() - $current->last_checked ); if ( $time_not_changed && ! $extra_stats ) { $plugin_changed = false; foreach ( $plugins as $file => $p ) { $new_option->checked[ $file ] = $p['Version']; if ( !isset( $current->checked[ $file ] ) || strval($current->checked[ $file ]) !== strval($p['Version']) ) $plugin_changed = true; } if ( isset ( $current->response ) && is_array( $current->response ) ) { foreach ( $current->response as $plugin_file => $update_details ) { if ( ! isset($plugins[ $plugin_file ]) ) { $plugin_changed = true; break; } } } // Bail if we've checked recently and if nothing has changed if ( ! $plugin_changed ) return false; } // Update last_checked for current to prevent multiple blocking requests if request hangs $current->last_checked = time(); set_site_transient( 'update_plugins', $current ); $to_send = compact( 'plugins', 'active' ); $locales = array( get_locale() ); /** * Filter the locales requested for plugin translations. * * @since 3.7.0 * * @param array $locales Plugin locale. Default is current locale of the site. */ $locales = apply_filters( 'plugins_update_check_locales', $locales ); if ( defined( 'DOING_CRON' ) && DOING_CRON ) { $timeout = 30; } else { // Three seconds, plus one extra second for every 10 plugins $timeout = 3 + (int) ( count( $plugins ) / 10 ); } $options = array( 'timeout' => $timeout, 'body' => array( 'plugins' => json_encode( $to_send ), 'translations' => json_encode( $translations ), 'locale' => json_encode( $locales ), 'all' => json_encode( true ), ), 'user-agent' => 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ) ); if ( $extra_stats ) { $options['body']['update_stats'] = json_encode( $extra_stats ); } $url = $http_url = 'http://api.wordpress.org/plugins/update-check/1.1/'; if ( $ssl = wp_http_supports( array( 'ssl' ) ) ) $url = set_url_scheme( $url, 'https' ); $raw_response = wp_remote_post( $url, $options ); if ( $ssl && is_wp_error( $raw_response ) ) { trigger_error( __( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server’s configuration. If you continue to have problems, please try the support forums.' ) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ), headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE ); $raw_response = wp_remote_post( $http_url, $options ); } if ( is_wp_error( $raw_response ) || 200 != wp_remote_retrieve_response_code( $raw_response ) ) return false; $response = json_decode( wp_remote_retrieve_body( $raw_response ), true ); foreach ( $response['plugins'] as &$plugin ) { $plugin = (object) $plugin; } unset( $plugin ); foreach ( $response['no_update'] as &$plugin ) { $plugin = (object) $plugin; } unset( $plugin ); if ( is_array( $response ) ) { $new_option->response = $response['plugins']; $new_option->translations = $response['translations']; // TODO: Perhaps better to store no_update in a separate transient with an expiry? $new_option->no_update = $response['no_update']; } else { $new_option->response = array(); $new_option->translations = array(); $new_option->no_update = array(); } set_site_transient( 'update_plugins', $new_option ); } /** * Check theme versions against the latest versions hosted on WordPress.org. * * A list of all themes installed in sent to WP. Checks against the * WordPress server at api.wordpress.org. Will only check if WordPress isn't * installing. * * @since 2.7.0 * @uses $wp_version Used to notify the WordPress version. * * @param array $extra_stats Extra statistics to report to the WordPress.org API. * @return mixed Returns null if update is unsupported. Returns false if check is too soon. */ function wp_update_themes( $extra_stats = array() ) { include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version if ( defined( 'WP_INSTALLING' ) ) return false; $installed_themes = wp_get_themes(); $translations = wp_get_installed_translations( 'themes' ); $last_update = get_site_transient( 'update_themes' ); if ( ! is_object($last_update) ) $last_update = new stdClass; $themes = $checked = $request = array(); // Put slug of current theme into request. $request['active'] = get_option( 'stylesheet' ); foreach ( $installed_themes as $theme ) { $checked[ $theme->get_stylesheet() ] = $theme->get('Version'); $themes[ $theme->get_stylesheet() ] = array( 'Name' => $theme->get('Name'), 'Title' => $theme->get('Name'), 'Version' => $theme->get('Version'), 'Author' => $theme->get('Author'), 'Author URI' => $theme->get('AuthorURI'), 'Template' => $theme->get_template(), 'Stylesheet' => $theme->get_stylesheet(), ); } // Check for update on a different schedule, depending on the page. switch ( current_filter() ) { case 'upgrader_process_complete' : $timeout = 0; break; case 'load-update-core.php' : $timeout = MINUTE_IN_SECONDS; break; case 'load-themes.php' : case 'load-update.php' : $timeout = HOUR_IN_SECONDS; break; default : if ( defined( 'DOING_CRON' ) && DOING_CRON ) { $timeout = 0; } else { $timeout = 12 * HOUR_IN_SECONDS; } } $time_not_changed = isset( $last_update->last_checked ) && $timeout > ( time() - $last_update->last_checked ); if ( $time_not_changed && ! $extra_stats ) { $theme_changed = false; foreach ( $checked as $slug => $v ) { if ( !isset( $last_update->checked[ $slug ] ) || strval($last_update->checked[ $slug ]) !== strval($v) ) $theme_changed = true; } if ( isset ( $last_update->response ) && is_array( $last_update->response ) ) { foreach ( $last_update->response as $slug => $update_details ) { if ( ! isset($checked[ $slug ]) ) { $theme_changed = true; break; } } } // Bail if we've checked recently and if nothing has changed if ( ! $theme_changed ) return false; } // Update last_checked for current to prevent multiple blocking requests if request hangs $last_update->last_checked = time(); set_site_transient( 'update_themes', $last_update ); $request['themes'] = $themes; $locales = array( get_locale() ); /** * Filter the locales requested for theme translations. * * @since 3.7.0 * * @param array $locales Theme locale. Default is current locale of the site. */ $locales = apply_filters( 'themes_update_check_locales', $locales ); if ( defined( 'DOING_CRON' ) && DOING_CRON ) { $timeout = 30; } else { // Three seconds, plus one extra second for every 10 themes $timeout = 3 + (int) ( count( $themes ) / 10 ); } $options = array( 'timeout' => $timeout, 'body' => array( 'themes' => json_encode( $request ), 'translations' => json_encode( $translations ), 'locale' => json_encode( $locales ), ), 'user-agent' => 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' ) ); if ( $extra_stats ) { $options['body']['update_stats'] = json_encode( $extra_stats ); } $url = $http_url = 'http://api.wordpress.org/themes/update-check/1.1/'; if ( $ssl = wp_http_supports( array( 'ssl' ) ) ) $url = set_url_scheme( $url, 'https' ); $raw_response = wp_remote_post( $url, $options ); if ( $ssl && is_wp_error( $raw_response ) ) { trigger_error( __( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server’s configuration. If you continue to have problems, please try the support forums.' ) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ), headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE ); $raw_response = wp_remote_post( $http_url, $options ); } if ( is_wp_error( $raw_response ) || 200 != wp_remote_retrieve_response_code( $raw_response ) ) return false; $new_update = new stdClass; $new_update->last_checked = time(); $new_update->checked = $checked; $response = json_decode( wp_remote_retrieve_body( $raw_response ), true ); if ( is_array( $response ) ) { $new_update->response = $response['themes']; $new_update->translations = $response['translations']; } set_site_transient( 'update_themes', $new_update ); } /** * Performs WordPress automatic background updates. * * @since 3.7.0 */ function wp_maybe_auto_update() { include_once( ABSPATH . '/wp-admin/includes/admin.php' ); include_once( ABSPATH . '/wp-admin/includes/class-wp-upgrader.php' ); $upgrader = new WP_Automatic_Updater; $upgrader->run(); } /** * Retrieves a list of all language updates available. * * @since 3.7.0 */ function wp_get_translation_updates() { $updates = array(); $transients = array( 'update_core' => 'core', 'update_plugins' => 'plugin', 'update_themes' => 'theme' ); foreach ( $transients as $transient => $type ) { $transient = get_site_transient( $transient ); if ( empty( $transient->translations ) ) continue; foreach ( $transient->translations as $translation ) { $updates[] = (object) $translation; } } return $updates; } /** * Collect counts and UI strings for available updates * * @since 3.3.0 * * @return array */ function wp_get_update_data() { $counts = array( 'plugins' => 0, 'themes' => 0, 'wordpress' => 0, 'translations' => 0 ); if ( $plugins = current_user_can( 'update_plugins' ) ) { $update_plugins = get_site_transient( 'update_plugins' ); if ( ! empty( $update_plugins->response ) ) $counts['plugins'] = count( $update_plugins->response ); } if ( $themes = current_user_can( 'update_themes' ) ) { $update_themes = get_site_transient( 'update_themes' ); if ( ! empty( $update_themes->response ) ) $counts['themes'] = count( $update_themes->response ); } if ( ( $core = current_user_can( 'update_core' ) ) && function_exists( 'get_core_updates' ) ) { $update_wordpress = get_core_updates( array('dismissed' => false) ); if ( ! empty( $update_wordpress ) && ! in_array( $update_wordpress[0]->response, array('development', 'latest') ) && current_user_can('update_core') ) $counts['wordpress'] = 1; } if ( ( $core || $plugins || $themes ) && wp_get_translation_updates() ) $counts['translations'] = 1; $counts['total'] = $counts['plugins'] + $counts['themes'] + $counts['wordpress'] + $counts['translations']; $titles = array(); if ( $counts['wordpress'] ) $titles['wordpress'] = sprintf( __( '%d WordPress Update'), $counts['wordpress'] ); if ( $counts['plugins'] ) $titles['plugins'] = sprintf( _n( '%d Plugin Update', '%d Plugin Updates', $counts['plugins'] ), $counts['plugins'] ); if ( $counts['themes'] ) $titles['themes'] = sprintf( _n( '%d Theme Update', '%d Theme Updates', $counts['themes'] ), $counts['themes'] ); if ( $counts['translations'] ) $titles['translations'] = __( 'Translation Updates' ); $update_title = $titles ? esc_attr( implode( ', ', $titles ) ) : ''; $update_data = array( 'counts' => $counts, 'title' => $update_title ); /** * Filter the returned array of update data for plugins, themes, and WordPress core. * * @since 3.5.0 * * @param array $update_data { * Fetched update data. * * @type array $counts An array of counts for available plugin, theme, and WordPress updates. * @type string $update_title Titles of available updates. * } * @param array $titles An array of update counts and UI strings for available updates. */ return apply_filters( 'wp_get_update_data', $update_data, $titles ); } function _maybe_update_core() { include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version $current = get_site_transient( 'update_core' ); if ( isset( $current->last_checked ) && 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked ) && isset( $current->version_checked ) && $current->version_checked == $wp_version ) return; wp_version_check(); } /** * Check the last time plugins were run before checking plugin versions. * * This might have been backported to WordPress 2.6.1 for performance reasons. * This is used for the wp-admin to check only so often instead of every page * load. * * @since 2.7.0 * @access private */ function _maybe_update_plugins() { $current = get_site_transient( 'update_plugins' ); if ( isset( $current->last_checked ) && 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked ) ) return; wp_update_plugins(); } /** * Check themes versions only after a duration of time. * * This is for performance reasons to make sure that on the theme version * checker is not run on every page load. * * @since 2.7.0 * @access private */ function _maybe_update_themes() { $current = get_site_transient( 'update_themes' ); if ( isset( $current->last_checked ) && 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked ) ) return; wp_update_themes(); } /** * Schedule core, theme, and plugin update checks. * * @since 3.1.0 */ function wp_schedule_update_checks() { if ( !wp_next_scheduled('wp_version_check') && !defined('WP_INSTALLING') ) wp_schedule_event(time(), 'twicedaily', 'wp_version_check'); if ( !wp_next_scheduled('wp_update_plugins') && !defined('WP_INSTALLING') ) wp_schedule_event(time(), 'twicedaily', 'wp_update_plugins'); if ( !wp_next_scheduled('wp_update_themes') && !defined('WP_INSTALLING') ) wp_schedule_event(time(), 'twicedaily', 'wp_update_themes'); if ( ( wp_next_scheduled( 'wp_maybe_auto_update' ) > ( time() + HOUR_IN_SECONDS ) ) && ! defined('WP_INSTALLING') ) wp_clear_scheduled_hook( 'wp_maybe_auto_update' ); } if ( ( ! is_main_site() && ! is_network_admin() ) || ( defined( 'DOING_AJAX' ) && DOING_AJAX ) ) return; add_action( 'admin_init', '_maybe_update_core' ); add_action( 'wp_version_check', 'wp_version_check' ); add_action( 'upgrader_process_complete', 'wp_version_check', 10, 0 ); add_action( 'load-plugins.php', 'wp_update_plugins' ); add_action( 'load-update.php', 'wp_update_plugins' ); add_action( 'load-update-core.php', 'wp_update_plugins' ); add_action( 'admin_init', '_maybe_update_plugins' ); add_action( 'wp_update_plugins', 'wp_update_plugins' ); add_action( 'upgrader_process_complete', 'wp_update_plugins', 10, 0 ); add_action( 'load-themes.php', 'wp_update_themes' ); add_action( 'load-update.php', 'wp_update_themes' ); add_action( 'load-update-core.php', 'wp_update_themes' ); add_action( 'admin_init', '_maybe_update_themes' ); add_action( 'wp_update_themes', 'wp_update_themes' ); add_action( 'upgrader_process_complete', 'wp_update_themes', 10, 0 ); add_action( 'wp_maybe_auto_update', 'wp_maybe_auto_update' ); add_action('init', 'wp_schedule_update_checks'); La guerra es la madre de la civilizaciónSesiónDeControl.com
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Materia

Este artículo ha sido escrito en Materia, web de noticias de ciencia, tecnología, salud y medio ambiente, que comparte su contenido para ser republicado.


Escrito el 3 de octubre de 2013 a las 18:21 | Clasificado en Historia

Un modelo matemático muestra que la competencia entre sociedades, la guerra, fue el impulso evolutivo que llevó a las pequeñas tribus a unirse en grupos humanos gigantescos, anónimos y complejos como los actuales.

Mongoles. (Materia)
Mongoles. (Materia)

Ahora puede parecer algo normal, pero hasta hace muy poco, nadie dejaba decisiones fundamentales para su vida en manos de desconocidos que vivían en ciudades lejanas. La cercanía del jefe de la tribu y la familiaridad con todos los miembros de una sociedad pequeña tiene valores que no se abandonarían sin un buen motivo. Esa fuerza que impulsó a los pequeños grupos humanos a fundirse en sociedades descomunales y anónimas fue, según un nuevo estudio, la guerra.

Esta conclusión es parte de un análisis realizado a partir de un modelo matemático que hoy se publica en la revista “Proceedings of the National Academy of Sciences”. Introduciendo factores sobre la geografía, la ecología o las innovaciones militares de las diversas sociedades, y añadiendo un mecanismo de evolución cultural, recrearon un periodo de 3.000 años, entre el 1500 a.C y 1500 d.C., que después se cotejó con el registro histórico. El modelo fue capaz de predecir cuándo y dónde surgirían las civilizaciones con sociedades complejas y de gran tamaño con un 65% de acierto.

Competición y lucha

Cuando a ese mismo modelo se le quitaba el efecto de la difusión de tecnología militar, su coincidencia con lo sucedido en realidad se reducía al 16%. Según los autores, esta es una muestra de que la aparición y el mantenimiento de instituciones y mecanismos que sirvan para cooperar con individuos con los que no se tiene parentesco se ve influida por la competencia entre sociedades, una competición que los autores recogen, fundamentalmente, como enfrentamiento bélico. Como si fuesen organismos que compiten entre ellos, afirma el estudio, las sociedades con rasgos que permitan un mayor control del grupo y sean capaces de coordinar a un mayor número de sus miembros, se impondrán a otras sociedades que no cuentan con esos rasgos.

El enfoque de los investigadores, formado por un grupo interdisciplinar de EEUU y Reino Unido, pretende demostrar que, como dijo Arnold Toynbee, la historia no es la sucesión de “una maldita cosa tras otra” sino que existen “mecanismos generales en juego que modelan los patrones generales de la historia”. En lo que se puede considerar una afirmación optimista, uno de los autores del estudio, Sergey Gavrilets, director de actividades científicas del Instituto Nacional para la Síntesis Matemática y Biológica, afirma que “explicar los sucesos históricos [con su modelo] nos ayuda a entender mejor el presente y, finalmente, puede ayudar a predecir el futuro”.

De momento, gracias a su simulación han observado cómo la presión de otras sociedades empujó a los humanos de lo que hoy es Oriente Medio o China hacia la civilización. Las sociedades agrarias, que habían surgido en regiones apropiadas, como las fértiles cuencas de los ríos Nilo, Tigris y Eúfrates, incrementaron su capacidad para guerrear entre ellas por el contacto con las tribus nómadas de la estepa. Estos grupos humanos desarrollaron importantes avances en la tecnología de guerra, como los carros de combate tirados por caballos o la caballería pesada. Aquellos avances, igual que en el caso de los grandes agricultores de Oriente Medio, aparecieron en la estepa de Eurasia por unas características ecológicas determinadas: estaba llena de caballos listos para ser domesticados.

La competición y el intercambio tecnológico entre ambos tipos de sociedad favoreció la aparición de grandes instituciones y burócratas profesionales para gestionar y mantener cohesionadas a aquellos complejos grupos humanos. Como sucede en la competición entre seres vivos, en ese entorno de intensa competencia no había mucha elección. Las sociedades que no avanzaban hacia mayores grados de complejidad eran fagocitadas por las civilizaciones capaces de movilizar grandes ejércitos y de alimentarlos y armarlos con sistemas de producción de bienes muy organizados.

Además de obtener conclusiones como las anteriores, los autores del estudio consideran que este trabajo muestra que la combinación de los datos históricos disponibles y la teoría evolutiva puede desempeñar un interesante papel para lograr responder preguntas sobre la historia humana y la evolución cultural. Modelos como el empleado por este grupo de investigadores, permite testar las hipótesis frente a la historia real y averiguar así si se ajustan mejor o peor a la realidad. Y más importante, la posibilidad de introducir o extraer factores concretos, como se hace en el artículo publicado en PNAS con la difusión de la tecnología militar, permite comparar el valor de hipótesis alternativas para explicar unos datos concretos.

Fuente: La guerra es la madre de la civilización

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