Misc: In 1728 Johann---------- , Swiss mathematician, proved pi is irrational ?

Questions

Followers of which religion use prayer wheels?

C.F.C.'s are said to be damaging to the ozone layer. For what do the initials C.F.C. stand?

Which film star made his screen debut in the film "Steamboat Willie" in 1928?

Plus fours, the type of trousers much loved by golfers, are an example of which type of men's fashion?

In Edward Lear's poem, upon which fruit did the Owl and the Pussycat dine?