Here's a clever way to teach kids about the food chain.
http://eisforexplore.blogspot.com/2012/10/food-chain-stacking-cups.html
Willie Harris and Alex Brown, photographed in Stockton, Calif. |
Well, say you get the chicken pox when you're 4 years old. Your immune system figures out how to fight it. So you don't get it again. But if you get measles when you're 5 years old, it could wipe out the memory of how to beat back the chicken pox.That's been known for a while, but the effects were believed to be short-lived, perhaps only as long as the measles virus was active in a person's system. Mina and team came to a different conclusion. Per their research, this "immune amnesia" can last two or three years -- long enough where children are exposed to lots of different diseases to which they have become once again vulnerable.
Darrell Wallace Jr.
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