It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Rumel, A detective who was mere days from cracking an international smuggling ring has suddenly gone missing. While inspecting his last-known location, you find a note:

710 57735 34 5508 51 7718

Currently, there are 3 suspects: Bill, John, and Todd. Can you break the detective's code and find the criminal's name?

Can you find the dog hidden in a group of pandas?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

Kohli and Dhoni decided to have a paintball match.
Kohli told Dhoni, "Sir it is not right as you got thrice the paintballs I have".

Dhoni instantly gives Kohli 10 hit paintballs.
Kohli replied, "Sir, I believe you still have twice the paintballs than I have".

Dhoni gives "?" more paintballs to Kohli.
Kohli replied, "Sir it is even now, Let us have a match".

What is "?".