It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

What has a ring but no finger?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Why is it against the law for a man living in Delhi to be buried in Mumbai?

By what process could you make a 'Tea-Table' into food?

You are confined in a room and given two metal rods. Out of these two rods, one is magnet and the other is the iron rod. They look starkly similar. You don't have any other metal object in the room.

How will you decide which one of those is magnet?

Spot 5 differences in two Christmas tree below:

Decode below three cipher riddles:

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