Find the hidden tiger in the given optical illusion ?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

If six children and two dogs were under an umbrella, how come none of them got wet?

What has no start, end, or centre?

Can you decipher these quotes by Albert Einstein?
Blf xzm mvevi hloev z kilyovn lm gsv ovevo lm dsrxs rg dzh xivzgvw.

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?

How can you leave a room with two legs and return with six legs?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?