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The Art of Hunting

Most of us have seen a praying mantis. Two thousand species of praying mantis are scattered throughout the world, ranging in size from less than half an inch (1.27 cm) to more than five inches (12.7 cm). In tropical regions, up to 350 species can inhabit an area. Although most of us place praying mantises in a class of their own, entomologists have ...

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PrayingMantis
Astronomy

Mount Olympus

Olympus Mons, the largest volcano in the solar system, towers a breathtaking 25 km above the surrounding plains on Mars. Until recently scientists thought that Olympus Mons and other volcanoes on the ... Continue reading

MountOlympus
Medicine

Hypotension

Bend to select a book from the lowest shelf, then rise quickly. Chances are, you'll feel a little lightheaded for a few seconds. The reason is a drop of blood pressure caused by the change in ... Continue reading

Hypotension
Chemistry

Carbon Dating

As isotopes break down, or decay they give off radiation. Materials that decompose in this way are said to have a 'half-life'. As the quantity of material present decreases, so does the actual rate at ... Continue reading

CarbonDating
Physics

The Sound of Turbulence

Do you ever watch the water tornado that forms in a draining bathtub? Woe unto any rubber ducky floating aimlessly in the vicinity; the water's force will pull it down into the tornado. The center of ... Continue reading

TheSoundofTurbulence

Lionfish Invasion

LionfishInvasionLionfish (Pterois volitans/miles complex) are beautiful, yet venomous, coral reef fish from Indian and western Pacific oceans that have invaded East Coast waters. Ironically, this species of lionfish is popular in large saltwater aquariums because of its brilliant maroon and white stripes and fan-like fins. However, beneath the fin's delicate exterior are venomous spines that are probably used for protection against predators.

Along the southeast United States, adult lionfish have been found at depths of 85 to 300 feet from Florida to North Carolina. Juvenile lionfish have also been observed in North Carolina, Bermuda and as far north as New York. NOAA scientists conclude that the large number of adults observed and the occurrence of juveniles indicates that lionfish are established and reproducing in coastal waters along the southeast United States. Furthermore, there is evidence that lionfish numbers are increasing.

Lionfish were likely first introduced off the Florida coast in the early to mid-1990s by intentional or unintentional release from the aquarium trade, including amateur home aquariums. There is no evidence suggesting that these lionfish derived from other common invasive species sources, such as ballast water dumping from the shipping industry, live-bait use by anglers or fouling on recreational boat hulls or semi-submersible oil platforms. Although it's still too early to predict the impact lionfish will have on the Atlantic coast, the damaging impacts of other invasive species have already left their mark on too many of the nation's valuable coastal ecosystems.