What is full of holes but still holds water?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Can you find out the remainder when 3^300 is divided by 5?

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

What has a bottom at the top?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

A boy was locked in a room by some robbers. All that is in the room is a piano, a calendar, and a bed. The room is locked from the outside. What does he eat, drink, and how does he escape and get out?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?