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It has long been known that the chemical atomic weight of hydrogen was greater than one-quarter of that of helium, but so long as fractional weights were general there was no particular need to explain this fact, nor could any definite conclusions be drawn from it.

Scientists didn't discover the noble gas helium - the second most common element in the universe - on Earth until 1895. And they thought it existed in minute quantities only, until miners found a huge underground cache in Kansas in 1903.

I'm lighter now in a lot of ways.

Before a secret is told, one can often feel the weight of it in the atmosphere.

Liquid helium belongs to a class of fluids known as quantum fluids, as distinct from classical fluids.

I've read short stories that are as dense as a 19th century novel and novels that really are short stories filled with a lot of helium.

I'm sort of a foot-on-the-gas kind of guy.

My bag always weighs a ton. I carry my whole bathroom with me. You never know what's going to happen in a day!

There are few moments in science in which you genuinely are excited. The discovery of superfluidity in helium-3 was one of those moments.