What has to be broken before you can use it?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Mr Black, Mr Gray, and Mr White are fighting in a truel. They each get a gun and take turns shooting at each other until only one person is left. Mr Black, who hits his shot 1/3 of the time, gets to shoot first. Mr Gray, who hits his shot 2/3 of the time, gets to shoot next, assuming he is still alive. Mr White, who hits his shot all the time, shoots next, assuming he is also alive. The cycle repeats. If you are Mr Black, where should you shoot first for the highest chance of survival?

Can you make four (4) nines (9) equal 100?

Solve the puzzle by telling what does below picture means.

It belongs to you, but other people use it more than you do. What is it?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

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