How is the moon similar to a dollar?

What can you see in the middle of March and April that you can never see in any other month?

What jumps when it walks and sits when it stands?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

What is the last thing you take off before bed?

When we see 2 but call 10?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

Can you solve below mathematical equation?

2^1234 - 2^1233

One absent-minded ancient philosopher forgot to wind up his only clock in the house. He had no radio, TV, telephone, internet, or any other means for telling time. So he travelled on foot to his friend's place a few miles down the straight desert road. He stayed at his friend's house for the night and when he came back home, he knew how to set his clock. How did he know?