What is common among 11, 69, and 88?

Can you find the six hidden animals in the picture below?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

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

The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

In the image below, can you find the value of an angle(y)

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

What Time Should the last watch show in the below figure?

Which is heavier: a ton of bricks or a ton of feathers?