NASA launches student rocket challenge

Nearly three dozen student teams from colleges, universities, high schools and some middle schools from around the country flocked to Huntsville, Ala., the location of the Marshall Space Flight Center, so their rockets could take flight.

Great white sharks have ‘toxic’ heavy metals in their blood, study finds

What do mercury, arsenic and lead have in common? If you guessed they’re all heavy metals, you’re right — at least in part. These elements are also found in the blood of great white sharks, according to a recent study.