Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

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

How could a baby fall out of a twenty-story building onto the ground and live?

Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

Arrange the numbers 1, 2, 3, 4, 5, 6, 7, 8 and 9 above and below the division line in a manner that the thus formed fractions equal to 1/3.

(You can use one number only once)

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Solve the counting riddle by identifying the number of triangles in the given picture.

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

Solve below popular number sequence
314 159 265 358 979 323 846 ?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?