What is the word or phrase?

If two's company, and three's a crowd, then whats four and five ?

What month of the year has 28 days?

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

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

Bay of Bengal is in which state?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

It is a nine-letter word.
The exact opposite of the phrase "friendly and outgoing"
It contains the word "over".
It starts will a vowel.

What is it?