I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

How can you tell a raw egg from a hard-boiled egg?

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Why Wine Glass Stem is so long?

What goes up but never comes down?