21Who invented the polio vaccine (injected, inactivated)?AJonas SalkBAlbert SabinCEdward JennerDLouis PasteurView AnswerDiscussWorkspaceReportSaveEasy
22Who invented the telescope used for astronomy (improved it greatly in 1609)?AIsaac NewtonBCopernicusCGalileo GalileiDKeplerView AnswerDiscussWorkspaceReportSaveEasy
23The aeroplane was invented by:ALouis BlériotBKarl BenzCHenry FordDThe Wright brothersView AnswerDiscussWorkspaceReportSaveEasy
24Who invented the telephone?AGuglielmo MarconiBThomas EdisonCAlexander Graham BellDNikola TeslaView AnswerDiscussWorkspaceReportSaveEasy
25Who built the first practical petrol-powered car?AEnzo FerrariBHenry FordCKarl BenzDRudolf DieselView AnswerDiscussWorkspaceReportSaveEasy