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.
Uses and properties. The image is of the sun because helium gets its name from âheliosâ, the Greek word for the sun. Helium was detected in the sun by its spectral lines many years before it was found on Earth.