How many triangles can you find in this given picture?

Find the next number in the sequence

5 12 24 36 ?

What goes through cities and fields, but never moves?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

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?

I cry without having a voice.
I fly without having wings.
I bite without having teeth.
I whisper without a mouth.

Who am I?

Spot what is wrong here in below Picture?

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?