Ubani othi uPi akulungile?
Ekuqaleni kwekhulu lama-21, uBob Palais (isazi sezibalo) noMichael Hartl (isazi sesayensi yezinto eziphilayo) bamemezela ukuthi uPi, okuyisilinganiso esivamile sesangqa, wayenephutha. Iphuzu labo liwukuthi uPi, ochazwa ngokuthi isilinganiso sobubanzi besiyingi nobubanzi baso, akuyona indlela ephumelela kunazo zonke noma ecacile yokuchaza ukuma kwesiyingi.  UPalais noHartl bagomela ngokuthi isilinganiso sobude besiyingi nesiyingi saso siyisilinganiso esiwusizo kakhulu. Bakhetha ukubiza lokhu okungaguquguquki ngokuthi i-Tau. Ngokwezibalo, uTau = 2*Pi.  Bathi i-Tau ikhiqiza izibalo ezihlanzekile kulo lonke i-physics, izibalo, nezibalo futhi, ngaphezu kwalokho, yenza kube lula ukufundisa i-trigonometry ne-analytic geometry kubafundi abasha.