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 was discovered after French astronomer Pierre-Jules-CÃ©sar Janssen noticed a yellow line around the Sun while studying a solar eclipse. Lockyer knew the wavelength of the color of this line, 587.49 nanometers, was not associated with any known elements on Earth and named this new element helium. Helium was not discovered on Earth until 1895. Helium, an unreactive and non-toxic gas, only makes up approximately 0.0005% of Earthâs atmosphere, but it is the second most abundant element in the universe behind only hydrogen.