Can you find the missing piece of the Porsche?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

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

Who am I?

What country can make you shiver?

Which city is three-fifths chick two third cat and 50% goat?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT