I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

I ask Joseph to pick any 5 cards out of a deck with no Jokers.

He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.

Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.

Why Aeroplane windows are round?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

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

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

Solve the mathematical equation in the picture below.

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

Why do we preferably have round manhole covers and not square ones?