What does does this rebus picture means ?

Name the three-letter word that can complete the below words:

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

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

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

By using all numbers, i.e. 123456789 and subtraction/addition, operators number 100 can be formed in many ways.
Example: 98 + 7 + 6 - 5 - 4 - 3 + 2 - 1 = 100

But if we add a condition use of the number 32 is a must. Then there are limited solutions.
One of such solution is: 9 - 8 + 76 + 54 - 32 + 1 = 100

Can you tell me any other solution?

In the following series, a set of numbers is progressing with a particular pattern. Can you deduce that pattern and find the missing set?

(2 + 6), (21 + 6), (58 + 6), (119 + 6), ___

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

10+10 and 11+11 can give you the same answer.

Explain how?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle: