If 21x = 79x, what is the value of x?

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

What goes up but never comes down?

Identify the 10 differences between the two given pictures.

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

A man died, leaving $10,000,000 for his widow, 5 sons and 4 daughters. Each daughter received an equal amount, each son received twice as much as a daughter, and the widow received three times as much as a son.

How much did the widow receive?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

By what process could you make a 'Tea-Table' into food?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?