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DEFINITION: (noun) Crystallization of a compound in at least two distinct forms. SYNONYMS: pleomorphism. USAGE: Calcium carbonate possesses the characteristic of polymorphism, since it crystallizes as calcite or aragonite.

The giant impact theory explains that billions of years ago, an object the size of Mars collided with the Earth. The resulting debris, which was hurled into orbit, consolidated to create the Moon. New observations from NASA's Spitzer Space Telescope suggest that moons like Earth's—that formed out of catastrophic collisions—are uncommon in the universe, arising at most in only 5 to 10 percent of planetary systems. The scientists calculated this probability from their observations of about 400 stars, all about 30 million years old.

Approximately 30,000 people participate in La Tomatina, an annual festival held on the last Wednesday in August in the Spanish town of Buñol. A weeklong festival features music, parades, dancing, and fireworks, but it is the tomato fight that draws the crowds. During the battle, more than 100 metric tons of overripe tomatoes are thrown in the streets. Participants must follow certain safety guidelines during the event, and wearing goggles is recommended. When does the tomato throwing begin?