August 11, 2013 -- Updated 1607 GMT (0007 HKT) The Pacu's large teeth aren't as sharp as a piranha's but are "fully capable" of severing fishing lines and fingers. Happy swimming! Quickly and carefully CNN's Igor Krotov and Neda Farshbaf contributed to this report. Science news July 16, 2013 -- Updated 1808 GMT (0208 HKT) Was Tyrannosaurus rex a predator or scavenger? The question has been a point of controversy in the scientific community for more than a century. June 5, 2013 -- Updated 2004 GMT (0404 HKT) Achilles' heel was his weak spot in the Greek myth, but the heel of a newly discovered primate provides a strong connection between humans and their possible ancestors. June 5, 2013 -- Updated 1541 GMT (2341 HKT) To get through the long, tedious hours sitting in the fossil archives at the University of California-Berkeley, Jason Head would listen to the hypnotic sounds of The Doors. June 4, 2013 -- Updated 1158 GMT (1958 HKT) There were three of them, one of them probably a child, and at least one met a gruesome end at the hands of a terrifying predator. June 5, 2013 -- Updated 1313 GMT (2113 HKT) Remember when woolly mammoths roamed the planet? No? Well don't worry if you missed the last ice age -- scientists have moved one step closer to possibly bringing the beasts back to life. May 29, 2013 -- Updated 1724 GMT (0124 HKT) A dinosaur from the Middle-Late Jurassic period, found in China, gives scientists new understandings of how birds evolved. May 20, 2013 -- Updated 1320 GMT (2120 HKT) A human embryo is smaller than the period at the end of a sentence. Scientists need to take from them stem cells, which have the potential to become any cell in the body. In the 1950s, scientists and technologists envisaged that by now the world would be free from disease, traversed by flying cars, and fueled by minerals from distant planets. May 24, 2013 -- Updated 0726 GMT (1526 HKT) With its vast array of freaky specimens that seem to belong in some haunted manor, Philadelphia's 150-year-old Mutter Museum may be the gold standard in medical museums. April 30, 2013 -- Updated 1421 GMT (2221 HKT) Ever since it was discovered in 2004, graphene has been hailed as a natural wonder of the materials world destined to transform our lives in the 21st century. April 21, 2013 -- Updated 1248 GMT (2048 HKT) In the midst of chaos here on Earth, scientists are finding hope for life on other planets. April 23, 2013 -- Updated 1013 GMT (1813 HKT) A mysterious, circular structure, with a diameter greater than the length of a Boeing 747 jet, has been discovered submerged about 30 feet (9 meters) underneath the Sea of Galilee in Israel. March 16, 2013 -- Updated 1444 GMT (2244 HKT) Archaeologists working alongside builders on a new London rail link have turned up a grisly find that harks back seven centuries, to a time when Black Death stalked the medieval city.