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How To Calculate The Area Of A Cylinder

Understanding how to find the area of a cylinder is easy if one first visualizes the cylinder and breaks its surface down into component pieces. To do this, first take a good look at the most common cylinder encountered in life: the toilet paper roll. Use a pair of scissors to cut one open and you will see that it is just a rectangular piece of ...

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AreaOfACylinder
Biology

Grizzly Bear, (Ursus arctos horribilis)

A symbol of America's wildlands, the grizzly or brown bear is one of the largest North American land mammals. The grizzly bear's historic range covered much of North America from the mid-plains ... Continue reading

GrizzlyBear
Physics

Don't Make Waves

Fast and slow swimming pools? What are they? A given pool's walls and other components may create and reflect waves making it more difficult (slow) for athletes to swim. A fast pool minimizes wave ... Continue reading

SwimmingPools
Medicine

Encephalitis and Meningitis

Encephalitis and meningitis are inflammatory diseases of the membranes that surround the brain and spinal cord and are caused by bacterial or viral infections. Viral meningitis is sometimes called ... Continue reading

EncephalitisandMeningitis
Biology

Butterflies In Your Brain

The idea behind chaos theory is that complex systems have an inherent element of unpredictability. The human brain certainly qualifies as a complex system. It is also a chaotic system. It does not ... Continue reading

ButterfliesInYourBrain

Nature's Exceptions to Our Rules

NaturesExceptionsWe all learned in grade school that animals are classified into different categories: Mammals have fur, are warm blooded, give birth to their young and feed their babies milk. Birds have feathers, lay eggs and don't have teeth. Reptiles are cold blooded and lay eggs. Fish have gills and are cold blooded. Seems pretty simple, right?

Well, when you actually go out and look at all of the different animals out there, things get pretty complicated. For example, in what category do you put the platypus? A platypus has a duck-shaped bill that is made of soft leathery skin. It has fur, lays eggs, and has webbed feet. When the young are hatched, milk oozes out if the skin of the mother for the young to eat. The male platypus has one half inch long spurs on each hind leg connected to venom glands. The venom is strong enough to kill a dog. If that isn't enough, consider the echidna or spiny anteater. This animal has a long pointy snout and a sticky tongue to eat ants similar to an anteater, has spiny fur like a porcupine, and develops a pouch for it's young to live in after it's eggs hatch! With all of these anomalies, they both are still considered mammals, and belong to the same sub family called the Monotrens. They are the only animals in this sub family.

Scientists like to categorize all living things, but there always seems to be exceptions to the rule. The platypus and echidna seem to fall into almost all categories, but were defined as mammals because they have fur, are warm blooded and lactate milk.