They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

A container contains 100 eggs. They can be either fresh or rotten. What is sure is the fact that there is at least one fresh egg in that container.

If you are asked to pick two eggs randomly from the container, at least one of them will be rotten.

Can you calculate how many eggs in that container are fresh?

Can you find out the missing number in the grid?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

You have to put a letter on the following to make it a meaningful word. The only challenge is that you can't use 'E'.

S E Q U E N C _

What runs around the whole yard without moving?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?