To ask your teacher!
How do we know the sky isn't really green and we've just colourblind?
Why do dogs sniff bums?
How's the diet going?
Haven't personal calculators rendered long division irrelevant?
Did you get up on the wrong side of bed this morning?
Why did they name Uranus Uranus?
If you poke yourself with a pencil will you get lead poisoning?
Could you repeat that question I wasn't listening?