Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

There was a strange boy who was born before his father. How can this be possible?

I look at you, you look at me I raise my right, you raise your left. What am I?

What is the largest number you can write with just 3 digits?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

Decode below three cipher riddles:

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

The ages of a father and son add up to 66.
The father's age is the son's age reversed.
How old could they be?
(3 possible solutions).

A time long back, there lived a king who ruled the great kingdom of Trojan House. As a part of the renovation of the kingdom to meet future security needs, he asked his chief architect to lay down a new play in a manner that all of his 10 castles are connected through five straight walls and each wall must connect four castles together. He also asked the architect that at least one of his castles should be protected with walls. The architect could not come up with any solution that served all of King's choices, but he suggested the best plan that you can see in the picture below. Can you find a better solution to serve the king's demand?

What does below chemistry rebus means?

What has 13 hearts but no other organs?