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Non-Flammable Fuel?

When we're flying high above the Earth, few of us give much thought to aircraft safety. We're usually too busy wondering when lunch is going to be served. But flying safely is a goal of NASA's Glenn Research Center (GRC) in Cleveland, Ohio. They're working on the problems that could arise if fuel in the tanks were to accidentally ignite in flight ...

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NonFlammableFuel
Astronomy

Ancient Planet in a Globular Cluster Core

Long before our Sun and Earth ever existed, a Jupiter-sized planet formed around a sun-like star. Now, 13 billion years later, NASA's Hubble Space Telescope has precisely measured the mass of this ... Continue reading

GlobularClusterCore
Astronomy

Hats Off to the Sombrero

This nearly edge-on view of the Sombrero galaxy shows that the disks of spiral galaxies are incredibly thin. The majestic spiral arms cannot be seen in this side view of the Sombrero, named because it ... Continue reading

HatsOfftotheSombrero
Medicine

Why Is Blood Pressure Two Numbers?

Blood pressure might better be called heart pressure, for the heart's pumping action creates it. To measure blood pressure, health workers determine how hard the blood is pushing at two different ... Continue reading

WhyIsBloodPressureTwoNumbers
Astronomy

Reading The Colors of the Spectrum

Did you ever wonder how scientists can tell us so much about distant stars, for example, the surface temperature or chemical makeup of a star, light years away from Earth? Scientists can only use what ... Continue reading

SpectrumColors

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.