August 5, 2015
Special | 28m 8s
Extensive laboratory analysis has revealed just why the Arch has stains and answered the question: is it dirt or damage? Scientists are working to fight the fast-spreading disease that’s decimating the bat population. How some math teachers are developing innovative methods to enhance learning retention. Poachers who want White sturgeon eggs for caviar are putting the species survival in peril.
Aired: 08/04/15Video has closed captioning.