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

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Once upon a time, there was a castle on a square island. The entire island was surrounded by a 14m wide trench. The Romans had wanted to invade the castle and had brought a few wooden planks along with them to facilitate themselves in crossing the moat. The planks were however found to be only 13m long.

The Romans still managed to cross the trench. How did they do it?

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

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

Why are televisions attracted to people?

Can you place six matchsticks in a manner that each of the matchsticks is in touch with the other five matchsticks?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.