Chemistry is the scientific discipline involved with compounds composed of atoms, i.e. elements, and molecules, i.e. combinations of atoms: their composition, structure, properties, behavior and the changes they undergo during a reaction with other compounds. Chemistry addresses topics such as how atoms and molecules interact via chemical bonds to form new chemical compounds. There are four types of chemical bonds: covalent bonds, in which compounds share one or more electron(s); ionic bonds, in which a compound donates one or more electrons to another compound to produce ions: cations and anions; hydrogen bonds; and Van der Waals force bonds. See glossary of chemistry.
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Vitamin B3 is an essential part of our diet and if we don't get enough of it we can get nausea, anemia and tiredness and we can get it from such foods as salmon, avocados and nuts. A team of researchers thinks based on analysis of meteorites that it could come from icy dust grains in the depths of space delivered via comets and asteroids. It might even be possible that this vitamin helped speed up the formation of life on Earth and this might give us an insight as to how life may develop on other planets.
Contributed by Sam Feldstone
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