What is so fragile that saying its name breaks it?

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

I can turn polar bears white.
I can make anyone dance.
I can make everyone cry
I can make your hands clap
I can make you thin.
I can make you smile.
I can make you smile

Can you guess the riddle?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

I am green and found in the forest and have needles instead of leaves. What am I?
Hint 1: It can be used for Christmas decorations.
Hint 2: I have a strong, scent that is used in air fresheners.

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

Can you find the key in the picture below?