How does a dog know when to cross the street?
The seeing-eye dog, or any dog trained to guide the blind, cannot tell a red light from a green one. When it lead its master across the street, it watches the traffic flow to tell when it is safe to cross.
Which disease is the most devastating?
In all of history, the most destructive disease is malaria. More than 1.5 million people die from malaria every year.
How do you tell a black bear from a grizzly?
You can identify a grizzly bear's mark by the sign of five claws. A black bear will lacerate a tree trunk with four claws.
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