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What is superfluid helium?

“When cooled close to absolute zero, liquid helium becomes a superfluid that flows without friction and can creep up the walls of its container.”

Reference: American Physical Society

What saturation of sulfur dioxide will cause people to cough

Sulfur dioxide is a colorless gas with a suffocating, choking odor. It is toxic to humans and concentrations as low as 8 ppm will produce coughing. Incredibly, in the Odyssey, Homer describes the burning of sulfur (formation of SO2) as a way that homes were 'fumigated'.

Where was helium first discovered?

Helium was discovered in the Sun's light in 1868, decades before it was found on Earth.

Can helium freeze?

Helium is the only element that won't freeze at normal pressure, even at absolute zero.

Another fact

“When cooled close to absolute zero, liquid helium becomes a superfluid that flows without friction and can creep up the walls of its container.”

More from this shelf

What saturation of sulfur dioxide will cause people to cough

Where was helium first discovered?

Can helium freeze?