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Ultraviolet Light

Ultraviolet light is a form of radiation which is not visible to the human eye. It's in an invisible part of the 'electromagnetic spectrum'. Radiated energy, or radiation, is given off by many objects: a light bulb, a crackling fire, and stars are some examples of objects which emit radiation. The type of radiation being emitted depends on the ...

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UltravioletLight
Astronomy

Backyard Telescopes for New Planets. Is it Possible?

Fifteen years ago, the largest telescopes in the world had yet to locate a planet orbiting another star. Today telescopes no larger than those available in department stores are proving capable of ... Continue reading

BackyardTelescopes
Biology

Cougars, A Jumping Star

Cougars would make great basketball or track-and-field players. Of all the big cats, they are the best jumpers. They can jump 40 feet forward from a standing position, and 15 feet or higher straight ... Continue reading

CougarsAJumpingStar
Medicine

The Neurological Complications Of Lyme Disease

Lyme disease is caused by a bacterial organism that is transmitted to humans via the bite of an infected tick. Most people bitten by an infected tick develop a characteristic skin rash around the area ... Continue reading

LymeDisease
Geology

Global Warming?

The contiguous United States experienced its 16th coolest summer on record and seventh coolest August, according to scientists at NOAA Climatic Data Center in Asheville, N.C. While much of the West, ... Continue reading

GlobalWarming

When This Lake 'Burps,' Better Watch Out!

LakeBurpsNearly twenty years ago, two lakes in Cameroon, a country in Africa, 'burped,' killing hundreds of people. What makes a lake burp? Lake Nyos and Lake Monoun are unusual lakes. They each formed in the crater of a volcano that is dormant but not extinct. Under the lake, the magma, molten lava deep in the earth, gives off gases, including carbon dioxide (the gas that makes soda fizzy). The gases seep into the groundwater, and from there into the lake. Most of the time, the carbon dioxide stays dissolved in the cold water at the bottom of the lake, trapped there by layers of warmer water that lie near the surface. In large, deep lakes, these layers don't mix.

But if something happens to disturb the layers (like shaking the soda can!), the dissolved gas can come rushing to the surface and form a deadly cloud that spreads around the shores of the lake. A landslide, an earthquake, or even a big storm can set it off.

Carbon dioxide is a normal part of the air we breathe, but only a tiny part (0.3%). A cloud of carbon dioxide gas contains no oxygen, so we would suffocate if we breathed it. Carbon dioxide is heavier than air, so when the lakes 'burped,' the cloud stayed close to the ground, killing the people and animals near the lake shore. Last year, scientists stuck a vent pipe down to the bottom of both lakes. They hope this will let the trapped gas escape slowly and not build up to dangerous levels.