I make two people out of one. What am I?

What does below Rebus say?

XLR8

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Give it food and it will live; give it water and it will die.

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

In a guessing game, five friends had to guess the exact numbers of apples in a covered basket.
Friends guessed 22, 24, 29, 33, and 38, but none of the guesses was correct. The guesses were off by 1, 8, 6, 3, and 8 (in random order).

Can you determine the number of apples in a basket from this information?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”