Why do the majority of cartoon characters only have 8 digits instead of 10?

The unit square contains an infinite number of points. But is it 
countably or uncountably infinite?

Every Sudoku problem is a graph colouring problem. But is every graph 
colouring problem a Sudoku problem? (For suitable size and shape of 
Sudoku grid.)

A black hole forms when you have such an insanely vast amount of mass 
collected together in one place that it actually collapses under the 
sheer force of its own gravitational field, crushing itself into a space 
having zero volume and infinite density. So... how *the hell* do you 
make a /small/ black hole? Surely a small object wouldn't generate 
anywhere near enough gravity to form a black hole.

If the speed of light is constant, how the hell does light undergo 
Doppler shift?

Why do almost all species of birds bob their heads when they walk?

What is the purpose of receipts? I mean, seriously, if you're anything 
like me, you have hundreds of the damned things. What do you *do* with 


actually sit down and *check* these things? For every damned purchase 
they make?! [Obviously, for high-value items that you might need to 
return, or for goods that your employer is paying for, the usefulness is 
more obvious.]

Do spiders have a sense of smell?

Why is it called a "square root"? Surely "square route" would make far 
more sense...

Why do only large feathers fall out? I mean, you often find a single 
long black tail feather. But birds must have lots of smaller feathers 
also. How come you never see any of those laying around?

Who put the dip in the dip, di-dip, di-dip?

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