Helium is located on the top-left corner of periodic table of elements (Period 1, Group 18). It is a colorless gas which glows purple when exited. It has a boiling point of -269 degrees Celsius. While it is rare on Earth, it is the second most common element in the universe. It was identified in 1895 by Jules Janssen during a solar eclipse. It is produce by the alpha-decay of heavy radioactive nuclei. 

Liquid Helium is used in MRI machines and particle accelerators to cool down the superconducting magnets. It is also used in party balloons. It is also used in larger stars as a fusion source when they run out of Hydrogen.