What number when divided in half becomes zero?

What have one eye but still cannot see?

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

We have two identical balls in terms of diameter and weight. However, one of them is solid and the other is hollow.

Without knocking the ball, can you find the solid ball?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

A man was just doing his job when his suit was torn. Why did he die three minutes later?

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

A man dies of old age on his 25 birthday. How is this possible?