What goes up but never comes down?

Can you name four days which start with the letter 'T'?

Speaking of rivers, a man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

Okay before we begin with the puzzle, do keep in mind that you have to answer it quickly.

You are participating in a car race. Seeking the perfect moment, you overtake the second person in the race. What positions are you in now?

What Adam and Eve do not have but the rest of the people have?

You can hear me, but you can't touch or see me.

What am I?

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

What is the centre of gravity?

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?