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Ultrasound In Medicine

In medical testing, ultrasound equipment is used to produce a sonogram, or a picture of organs inside the body. Ultrasound scanners do not use X-rays. They use waves of such high frequency that they cannot be heard. (Frequency is the number of sound wave cycles per second. The highest frequency humans can hear is 20 thousand Hertz. The sound waves ...

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UltrasoundInMedicine
Astronomy

Pluto Is Way Out There

Long considered to be the smallest, coldest, and most distant planet from the Sun, Pluto may also be the largest of a group of objects that orbit in a disk-like zone of beyond the orbit of Neptune ... Continue reading

PlutoIsWayOutThere
Physics

How Fast is Mach 1?

A Mach number is a common ratio unit of speed when one is talking about aircrafts. By definition, the Mach number is a ratio of the speed of a body (aircraft) to the speed of sound in the undisturbed ... Continue reading

Mach1
Geology

Fossil Energy - The Basics

Contrary to what many people believe, fossil fuels are not the remains of dead dinosaurs. In fact, most of the fossil fuels we find today were formed millions of years before the first dinosaurs. ... Continue reading

FossilEnergyTheBasics
Geology

Salty Remnants At Death Valley's Badwater

Beneath the dark shadows of the Black Mountains, a great, extraordinarily flat expanse of shimmering white spreads out before you. You are at Badwater, at -282 feet it is the lowest spot in the ... Continue reading

SaltyRemnantsAtDeathValley

Giant Cloned Monster Loose In Mediterranean Sea

CaulerpaNative Caulerpa taxifolia is found in and around the waters of Florida and the Caribbean. It is a smallish, yet hardy saltwater plant that grows rapidly and is ideal for use in aquariums with diverse conditions. It does, though, require consistent light and warm temperatures to flourish. In other words, it occupies an ecological niche. The Stuttgart Aquarium in Germany tried to improve on Mother Nature and succeeded in developing a hardier variety. Apparently, they were pleased with the result. Their cloned version, however, little-resembled the native species. It was Caulerpa-on-steroids, fast growing and even hardier, comfortable both in warm and cold water, and in low-light environments. Rather than the diminutive native plant, this monster grew tall and strong. C. taxifolia proved so popular that it was soon found in public aquariums in France and Monaco. By 1984, it was a popular specimen in home aquariums. Better living through science.

Sometime around 1984, a small amount of our killer algae escaped from the Oceanographic Museum of Monaco into the Mediterranean Sea. Scientists estimated this original patch to be about a square yard. The patch liked its new home so much it grew and grew and grew. By 1989 it had blanketed over 2 square acres (.8 ha) of the sea floor. If this weren't bad enough, Caulerpa taxifolia was not a nice neighbor. It choked out native plants in its path, and altered fish populations as it rippled through the ecosystem. Fish that ate fish that ate plants, and so on. It impacted coastal towns, the fishing industry, tourism and much more. Talk about lack of diversity. Today, that little patch in the Mediterranean Sea covers over 14,000 acres (about 57 km) in a jungle of 10-foot (3 m) deep algae. It is clearly a man-made ecological disaster.