Which is faster, Heat or Cold ? Explain.

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

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?

What is the next shape from answers A, B, C, and D figure?

You are in a room that has three switches and a closed door. The switches control three light bulbs on the other side of the door. Once you open the door, you may never touch the switches again. How can you definitively tell which switch is connected to each of the light bulbs?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Do You See It?

What am I?

I have an eye but still cannot see.

Who am I?