Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

What can you hold in your right hand, but never in your left hand?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

Prove that twice of ten is the same as twice of eleven.

What am I?

Readers with the highest levels of visual skills can find three differences between the pictures of a lion on a scooter. Test your visual prowess now!

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.