Lucy was found by Donald Johanson and Tom Gray on November 24, 1974, at the site of Hadar in Ethiopia. They had taken a Land Rover out that day to map in another locality. After a long, hot morning of mapping and surveying for fossils, they decided to head back to the vehicle.
Alkanes are an example of saturated compounds. An unsaturated compound is a chemical compound that contains carbon-carbon double bonds or triple bonds, such as those found in alkenes or alkynes, respectively. Saturated and unsaturated compounds need not consist only of a carbon atom chain.
A solution containing a quantity of solute that is less than the concentration of the saturated solution under the given conditions is called unsaturated. In the absence of crystals of the solute, cooling of saturated solutions may not lead to crystallization, in which case a supersaturated solution results. A supersaturated solution contains more solute than a saturated solution.