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Friday - - MIND GAMES -

Each of these is a quiz ques­tion in its own right, but the an­swers con­nect to a com­mon theme, which could be any­thing from plumb straight­for­ward to bizarrely lat­eral 2 Which el­e­ment, one of only five metals that are liq­uid at room tem­per­a­ture (the other four be­ing ru­bid­ium, fran­cium, gal­lium and mer­cury), is used in the mak­ing of atomic clocks? 3 John Snow was the first to suc­cess­fully use what el­e­ment to dis­in­fect the wa­ter 1 In Pepto-Bis­mol, a drug used to treat mi­nor stomach upsets, what does the ‘Bis’ stand for? sup­ply in Soho, Lon­don, to stem the spread of an 1854 cholera out­break? 4 In higher an­i­mals what is re­quired for syn­the­sis of thy­roid hor­mones, of which this el­e­ment is a nec­es­sary in­gre­di­ent? 5 The pri­mary use of which el­e­ment is as a cat­alytic con­verter in au­to­mo­biles, where it changes harm­ful un­burned hy­dro­car­bons, car­bon monox­ide, and ni­tro­gen ox­ide emis­sions from the en­gine into less nox­ious gases?

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