Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

A Monkey, a squirrel, and an Eagle are racing to the top of the mango tree. Assuming all these animals are in perfect shape, Which animal will reach to Banana first?

What does this Rebus Picture mean?

A man was going to bleach his socks because they had gotten muddy the day before. As he was pouring the bleach into the washing machine, he spilt some on the floor. He got some cleaning fluid and mopped it up with a rag. Minutes later he was dead. What killed him?

The more of this there is, the less you see. What is it?

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