com/" } , { "title" : "Photos" , "link" : "https://www

The fuller name, Okapi BM25, includes the name of the first system to use it, which was the Okapi information retrieval system, implemented at London's City University[1] in the 1980s and 1990s

[7] It was initially available for download from its home at the SourceForge web site

hide Navigation Main page Contents Current events Random article About Wikipedia Contact us Contribute Help Learn to edit Community portal Recent changes Upload file Special pages Search Search Appearance Donate Create account Log in

1 200 OK Date: Thu, 02 Jul 2026 17:06:57 GMT Content-Type: text/html; charset=utf-8 Vary: X-PJAX, X-PJAX-Container, Turbo-Visit, Turbo-Frame, X-Requested-With, Sec-Fetch-Site,Accept-Encoding, Accept, X-Requested-With ETag: W/"5c10b5686e0c159df9d5da5670da3dcd" Cache-Control: max-age=0, private, must-revalidate Strict

server: mw-web.codfw.main-5b9465ddc4-sllrc x-content-type-options: nosniff content-language: en accept-ch: reporting-endpoints: csp-report-to-endpoint='/w/api.php?action=cspreport&format=json'; content-security-policy: script-src 'unsafe

com kagi2pv5bdcxxqla5itjzje2cgdccuwept5ub6patvmvn3qgmgjd6vid

server: ATS/9.2.13 x-content-type-options: nosniff content-language: en accept-ch: reporting-endpoints: csp-report-to-endpoint='/w/api.php?action=cspreport&format=json'; content-security-policy: script-src 'unsafe-eval' blob: 'self' meta.

Type of site Subsidiary Available in 32 [ 1 ] [ a ] languages Headquarters New York , New York , U

History [ edit ] The standard was proposed by Martijn Koster , [ 1 ] [ 2 ] when working for Nexor [ 3 ] in February 1994 [ 4 ] on the www-talk mailing list, the main communication channel for WWW-related activities at the time

server: mw-web.codfw.main-77cfb8ddf-5ckx9 x-content-type-options: nosniff content-language: en accept-ch: reporting-endpoints: csp-report-to-endpoint='/w/api.php?action=cspreport&format=json'; content-security-policy: script-src 'unsafe

8 Written in C++ Operating system Windows , Linux , macOS License Source-available commercial software with royalty model for commercial use [ 1 ] Website www

to sidebar hide Navigation Main page Contents Current events Random article About Wikipedia Contact us Contribute Help Learn to edit Community portal Recent changes Upload file Special pages Print/export Download as PDF Printable version In

move to sidebar hide Navigation Main page Contents Current events Random article About Wikipedia Contact us Contribute Help Learn to edit Community portal Recent changes Upload file Special pages Search Search Appearance Donate Create

com/world/asia-pacific/indonesia-bans-search-engine-duckduckgo-gambling-pornography-concerns-2024-08-02/ |url-status=live }}</ref> and [[China]]<ref>{{Cite web|title=DuckDuckGo joins Google in being blocked in China|url=https://www

server: mw-web.codfw.main-558d47f4c7-hc62r x-content-type-options: nosniff content-language: en accept-ch: reporting-endpoints: csp-report-to-endpoint='/w/api.php?action=cspreport&format=json'; content-security-policy: script-src 'unsafe

server: ATS/9.2.13 x-content-type-options: nosniff content-language: en accept-ch: reporting-endpoints: csp-report-to-endpoint='/w/api.php?action=cspreport&format=json'; content-security-policy: script-src 'unsafe-eval' blob: 'self' meta.

server: mw-web.codfw.main-5b9465ddc4-7bgrk x-content-type-options: nosniff content-language: en accept-ch: reporting-endpoints: csp-report-to-endpoint='/w/api.php?action=cspreport&format=json'; content-security-policy: script-src 'unsafe

sidebar hide Navigation Main page Contents Current events Random article About Wikipedia Contact us Contribute Help Learn to edit Community portal Recent changes Upload file Special pages Print/export Download as PDF Printable version In

server: ATS/9.2.13 x-content-type-options: nosniff content-language: en accept-ch: reporting-endpoints: csp-report-to-endpoint='/w/api.php?action=cspreport&format=json'; content-security-policy: script-src 'unsafe-eval' blob: 'self' meta.

move to sidebar hide Navigation Main page Contents Current events Random article About Wikipedia Contact us Contribute Help Learn to edit Community portal Recent changes Upload file Special pages Print/export Download as PDF Printable

sidebar hide Navigation Main page Contents Current events Random article About Wikipedia Contact us Contribute Help Learn to edit Community portal Recent changes Upload file Special pages Search Search Appearance Donate Create account Log

server: mw-web.codfw.main-95db66ff4-cdpkg x-content-type-options: nosniff content-language: en accept-ch: reporting-endpoints: csp-report-to-endpoint='/w/api.php?action=cspreport&format=json'; content-security-policy: script-src 'unsafe

server: ATS/9.2.13 x-content-type-options: nosniff content-language: en accept-ch: reporting-endpoints: csp-report-to-endpoint='/w/api.php?action=cspreport&format=json'; content-security-policy: script-src 'unsafe-eval' blob: 'self' meta.

png"},"collapsetext":{"wt":"Screenshot"},"screenshot_size":{"wt":"270"},"caption":{"wt":"Homepage as of January 20, 2026"},"url":{"wt":"{{url|https://www

server: ATS/9.2.13 x-content-type-options: nosniff content-language: en accept-ch: reporting-endpoints: csp-report-to-endpoint='/w/api.php?action=cspreport&format=json'; content-security-policy: script-src 'unsafe-eval' blob: 'self' meta.

server: mw-web.codfw.main-5d74746f87-qr5v2 x-content-type-options: nosniff content-language: en accept-ch: reporting-endpoints: csp-report-to-endpoint='/w/api.php?action=cspreport&format=json'; content-security-policy: script-src 'unsafe

(Top) 1 History Toggle History subsection 1.1 Expansion and spread 2 Processes 3 Systems by country Toggle Systems by country subsection 3.1 Armenia 3.2 Australia 3.3 Canada 3.4 China 3.5 Denmark 3.6 European Union 3.7 Finland

menu move to sidebar hide Navigation Main page Contents Current events Random article About Wikipedia Contact us Contribute Help Learn to edit Community portal Recent changes Upload file Special pages Search Search Appearance Donate Create

World health ( Global health - International health ) Disease prevention Disease surveillance Harm reduction Health promotion ( Behavior change ) Health indicators Human right to water and sanitation Right to health Supervised injection site Universal health care Lists and categories Terminology Journals National