MichaelMosleyexploresthelatestscienceabouthowourpersonalitiesarecreated-andwhethertheycanbechanged　　Despiteappearances,Mosleyisapessimistwhoconstantlyfretsaboutthefuture.Hewantstoworrylessandbecomemoreofanoptimist.　　Hetriesouttwotechniquestochangethisaspectofhispersonality-withsurprisingresults.　　Andhetravelstothefrontiersofgeneticsandneurosciencetofindoutabouttheforcesthatshapeallourpersonalities.