Rearrange the letters in "new door" to make one word.

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

10+10 and 11+11 can give you the same answer.

Explain how?

How many times can you subtract the number 5 from 25?

Using eight eights and addition only, can you make 1000?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

How many times do a clock's hands overlap in a day ?