▁ 1 5 ▁– ▁Intel ▁release ▁the ▁world ' s ▁first ▁micro processor , ▁the ▁ 4 0 0 4 . ▁ ▁Ray ▁Tom lin son ▁sends ▁the ▁first ▁AR PA net ▁e - mail ▁between ▁host ▁computers , ▁at ▁BB N , ▁Cambridge , ▁Massachusetts , ▁with ▁the ▁first ▁use ▁of ▁the ▁@ ▁sign ▁in ▁an ▁address . ▁ ▁Ken b ak - 1 ▁goes ▁on ▁sale . ▁It ▁is ▁considered ▁by ▁the ▁Computer ▁History ▁Museum ▁and ▁the ▁American ▁Computer ▁Museum ▁to ▁be ▁the ▁world ' s ▁first ▁personal ▁computer . ▁ ▁the ▁earliest ▁flo ppy ▁dis ks , ▁invent ed ▁at ▁IBM , ▁which ▁were ▁ 8 ▁inches ▁wide ▁and ▁long , ▁commer cially ▁available ▁by ▁ 1 9 7 1 ▁ ▁Computer ▁Space ▁is ▁released . ▁The ▁first ▁ar cade ▁video ▁game . ▁ ▁Conserv ation ▁ ▁February ▁ 2 ▁– ▁The ▁international ▁R ams ar ▁Convention ▁for ▁the ▁conservation ▁and ▁sust ain able ▁util ization ▁of ▁wet lands ▁is ▁signed ▁in ▁R ams ar , ▁Maz and aran , ▁Iran . ▁ ▁Earth ▁sciences ▁ ▁February ▁ 9 ▁– ▁The ▁San ▁Fernando ▁( S yl mar ) ▁earth qu ake ▁occurred ▁in ▁southern ▁California ▁with ▁a ▁magnitude ▁of ▁ 6 . 6 ▁and ▁a ▁perce ived ▁intensity ▁of ▁XI ▁( ext reme ) ▁on ▁the ▁Mod ified ▁Mer cal li ▁Int ens ity ▁scale . ▁ ▁Mathemat ics ▁ ▁Stephen ▁Cook ▁and ▁John ▁Hop cro ft ▁introduce ▁the ▁concept ▁of ▁N P - comple ten ess ▁in ▁computational ▁complexity