They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

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

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Doctor Alex and a bus driver John are both in love with the same woman named Olivia. The bus driver need to go for a long trip of 10 days, Before he left he gave Olivia 10 apples.

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

You need to move three matchsticks to form three squares. Can you do it?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?