Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

Before Mount Everest was discovered, what was the highest mountain in the world?

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

John was piloting a plane behind a car but was never able to overtake it. Why?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

How can you take 2 from 5 and leave 4?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?