On last count, there were nine planets in our solar system: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Soon, however, we might need to add a tenth planet to the solar lineup. Learn more on this Moment of Science.
Ever wonder what it's like on other planets? On this Moment of Science, find out what it's like on Mercury.
Learn about the new weapon researchers are using to fight toxic waste. "Toxin-loving Trees" on this Moment of Science.
Their descendants were even more vain, so in 16th century Venice mirror makers discovered the technique of backing a piece of glass with a reflecting metal composed of tin and mercury, producing a much clearer reflection.