By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

By moving just one matchstick, you need to make the below statement true. Can you do it?

Which wheel of car does not rotate when you turn your car right?

What famous saying does this rebus mean?

COME SERVED <---
COME SERVED
COME SERVED
COME SERVED
COME SERVED

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

Why despite killing dozens of people Charley and Wilma were not punished?

I’m tall when I’m young, and I’m short when I’m old. What am I?

What has hands, but can’t clap?