How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Solve this logical number series puzzle by replacing the question mark with the correct number
9090 = 4
1234 = 0
6055 = 2
9081 = 4
8888 = ?

What is always in front of you but can’t be seen?

I have branches, but no fruit, trunk or leaves. What am I?

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

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

Can you find the missing piece of the Porsche?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.