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DEFINITION: (noun) A speech or statement made as a farewell. SYNONYMS: valedictory, valedictory address. USAGE: During his valediction, Richard sneezed loudly, and the entire graduating class erupted in laughter.

A solar wind is a stream of ionized hydrogen, helium, and other heavy ions that radiates outward from the sun and reaches velocities of about 1 million mph (1.6 million km/h) during “quiet” periods. It pushes the gas of comets' tails away from the Sun, and its “gusts” cause geomagnetic disturbances and auroras on Earth. It is believed that the solar wind has stripped away up to 1/3 of Mars' original atmosphere. What protects the Earth's atmosphere?

A number of microwave popcorn producers have announced plans to remove diacetyl, a chemical used in artificial butter flavoring, from their products following reports that the substance may cause Bronchiolitis obliterans. The condition, nicknamed "popcorn lung," is often observed in popcorn factory workers and is characterized by inflammation and scarring in the airways of the lungs. Only one case of popcorn lung has been reported in someone who ate large quantities of the microwave snack, and he had been consuming several bags a day for a number of years.