Practice that feels like play. Get the app that teachers use. IXL’s free tablet app is here to make math and language arts practice fun and engaging for kids everywhere. Boasting all the functionality of the IXL website as well as a host of unique ta
Micheal DeForge (for NPR) How Bacteria in the Gut Fight Off Viruses You've got a trillion friends in low places: Bacteria in the gut may protect against viruses by signaling to your immune system their presence.