On a scorching hot summer afternoon along the banks of the Little Bighorn River in Montana, seasonal ranger Mike Donahue brings the historical Battle of Little Bighorn to life with remarkable enthusiasm and passion.
At a recent presentation, Donahue welcomes a crowd to the Little Bighorn Battlefield National Monument. "Why did it happen in the first place?" he asks during the presentation. "Because you had two peoples that really didn't understand or appreciate one another very well."
Not so long ago, most people thought that the only good microbe was a dead microbe.
But then scientists started to realize that even though some bugs can make us sick and even kill us, most don't.
In fact, in the past decade attitudes about the bacteria, fungi, viruses and other microbes living all over our bodies has almost completely turned around. Now scientists say that not only are those microbes often not harmful, we can't live without them.
As NPR reported in May, the number of Americans with Alzheimer's disease is expected to triple by 2050. But studies published in the last two weeks based in European countries show signs of declining dementia.