Researchers in Japan have begun a new study into a 300-year-old "mermaid mummy" to determine the exact origins of the gruesome remains.
Pi represents the ratio of the circumference of a circle to its diameter. Pi is an irrational number that never ends; the decimals go on forever and ever.
Scientists believe that Joro spiders arrived in the U.S. as stowaways in a shipping container.
Centrifugal and centripetal are two closely related forces that describe circular motion, but the meanings are often mixed up.