What has a thumb and four fingers, but is not a hand?

I am an odd number. Take away a letter and I become even. What number am I?

What question can you never answer yes to?

The more of this there is, the less you see. What is it?

What is black when it’s clean and white when it’s dirty?

What invention lets you look right through a wall?

I am the beginning of everything, the end of everywhere. I’m the beginning of eternity, the end of time and space. What am I?

How are you today?

I follow you all the time and copy your every move, but you can’t touch me or catch me. What am I?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

What can travel all around the world without leaving its corner?

What has four wheels and flies?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?