There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

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

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

Be active and find the killer in the picture Riddle below.

I am lying and I always lie. Tell me whether I am lying or telling the truth.

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

10+10 and 11+11 can give you the same answer.

Explain how?

Replace the (?) with the correct mathematical signs to make the expression equal to 59.

18 ? 12 ? 4 ? 5 = 59