Q. Are cats color blind?
A. No one knows for sure how much color cats do or don't see, or if they are color blind. most experts believe that cats see in black and white. A few say that cats may see tints of red, but ther isn't anywidespread acceptance of this. Cats have better eyesight than humans because they have more reflectors within the eye to use in the dark. They can't see in the dark as some people believe, but they can see a lot more in dim light than we can. the cat, interestingly, was not made a domestic animal by humans. In fact, the cat turned itself into a domesticated animal. It has adapted to the many conditions that are different fromt the wild. In this regard, it doesn't always need its good eyesight to survive.
Q. How many keys did T. rex have?
A. At one time, Tyrannosaurus rex had about 50 teeth. However, dinosaurs had replaceable teeth. In a lifetime a dinosaur might have gone through hundreds of teeth! This is typical of reptiles today. Mammals have limited sets of teeth. For example, humans have two sets: baby teeth and permanent teeth. Reptiles continually replace their teeth when they are lost. The teeth of T. rex were long, pointed and slightly curved. They were about 6 inches long - 10 inches if you include the root. Like most meat-eaters, T. rex's teeth had sharp points.
Q. Where do tornadoes come from?
A. Scientists don't completely understand how tornadoes form. They do know that most tornadoes are born in violent thunderstorms, says 3-2-1 contact magazine.
Violent thunderstorms form in a zone where cool, dry air meets warm, moist air. As the warm air shoots up, more warm air takes it's place. If this happens over and over, the air starts to swirl.
The swirling air becomes a tunnel of racing winds wrapped around a tube of low pressure. The low pressure gives the tornado suction power. Its winds can whirl at speeds of 200 miles per hour. The tornado itself zips across the ground at 25 to 60 miles per hour.
The National Weather Service keeps an eye on tornado weather. Most tornados twist and turn in late spring in the southern and midwestern United States. People in tornado zones are prepared to take cove when a tornado stops by on its "whirl tour!"