Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

Thirty friends were on a hiking trip when they decided to enjoy the bonfire. They assembled for it and agreed to play a game. For that, they divided themselves into five teams with seven members each, forming five rows.

How did they manage to achieve this formation?

Using Only Five 5's and any mathematical operator make sum as 37

A father's child, a mother's child, yet no one's son.

Who am I?

What is black when you buy it, red when you use it, and gray when you throw it away?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Three ants are sitting at the three corners of an equilateral triangle. Each ant starts randomly picks a direction and starts to move along the edge of the triangle. What is the probability that none of the ants collide?