The video discusses the discovery of helium during a solar eclipse in 1868 by Pierre Janssen and Norman Lockyer. Helium is a noble gas, the second most abundant element in the universe, formed during the Big Bang and through nuclear fusion in stars. On Earth, helium is sourced from natural gas fields and radioactive decay. It is used in balloons, medical cryogenics, and airships due to its low density and non-flammability. However, helium poses safety risks, such as suffocation and lung damage if inhaled improperly.

In what ways is helium used in the medical field?

What hazards are associated with inhaling helium?