This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

Name a key which is hardest to turn.

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Which is faster, Heat or Cold ? Explain.

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

A man dies of old age on his 25 birthday. How is this possible?

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

Can you count the number of triangles in the picture below?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?