Interesting facts about Helium?

Question

Can you give me two INTERESTING facts about Helium?

And two uses of them?

I already know they are use for balloons but what else?

Answer 1

Did you know that helium was used in World War2!

Did you know that most helium on earth is produced by radioactive decay in rocks!

Did you know that if you put helium in a balloon and let go of the balloon,

the balloon rises until it pops!

Find more in the link below.

Answer 2

helium was first discovered on the sun a- application of spectroscopy

helium is he coldest liquid known - has many scientific applications