Why Aeroplane windows are round?

A wealthy man lives alone in a small cottage. Being partially handicapped he had everything delivered to his cottage. The mailman was delivering a letter one Thursday when he noticed that the front door was ajar. Through the opening he could see the man's body lying in a pool of dried blood. When a police officer arrived he surveyed the scene. On the porch were two bottles of warm milk, Monday's newspaper, a catalog, flyers, and unopened mail. The police officer suspects it was foul play. Who does he suspect and why?

I am a type of word that is spelt incorrectly or used differently, on purpose for humour. What am I?
Hint 1: You can find me in a joke.
Hint 2: I am a play on words.

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

What does it mean?

What came first, the chicken or the egg?

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

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

Prove that the below maths equation is true.

8 + 8 = 91