by Sara Novak
© iStockphoto.com/Peta Curnow
DCL
Which of the Great Apes could be the first to go extinct? How many Bengal tigers are left in the wild? What's killing the pika?
Species are currently going extinct at a staggering rate due to habitat infringement, poaching, and other eco-issues. Test your knowledge about threatened species in our quiz:
What's so smart about these windows? For one thing, they know the importance of saving energy. What else makes them smarter than your average window?
Almost all Americans come into contact with household cleaners, some several times a day. And most of those cleaners contain harsh chemicals that can be dangerous for your health and your home.
