The second issue of Food Security is now published, and is free online. It documents some of the multiple causes of food insecurity.
Helium can be found in underground deposits in the earth. Helium can also be found in stars and other planets. The helium underground - and extracted from natural-gas - is a by-product of the natural radioactive decay of uranium, though is far too stable to be radioactive itself. It also occurs in very small amounts in the atmosphere.
Helium Helium is a colorless unreactive gas that is less dense that air. It belongs to the Noble gases which is the last group on the far right of the Periodic table. All of the Noble gases are chemically unreactive because they contain a complete number of electrons in the outer shell. Helium gas if often used in party balloons as it is lighter than air. Helium is also found in the sun and the stars where it is formed through a series of nuclear fusion reactions involving hydrogen.