What four weights can be used to balance from 1 to 30 pounds?

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?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

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

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Where do you go to learn how to make ice cream?

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

It is always ahead of me yet I can never see it. What is it?

Can you place three balls such that the equation shown in the picture holds true?