Which alphabet is a part of our body?

Can you decipher the below rebus?

PBLUESAISNUERSES

What word does this rebus represent?

meta meta
meta meta

What does below Rebus mean ?

esgg sgeg gegs gsge

Find the value of "?" in the ball picture Riddle below:

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

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

which number am I?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

You have two bottles of pills marked with labels A and B. The pills are identical. The doctor has asked you to take one A pill and one B pill daily. You cant take more or less than that.

While taking out the pills one day, you took out one pill from A and by mistake took out two from B. You have no idea which pill is which now.

You cant throw away the expensive pills. What will you do now?

In two decks of cards, what is the least amount of cards you must take to be *guaranteed* at least one four-of-a-kind?