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Guide to Propulsion

What is propulsion? The word is derived from two Latin words: pro meaning before or forwards and pellere meaning to drive. Propulsion means to push forward or drive an object forward. A propulsion system is a machine that produces thrust to push an object forward. On airplanes, thrust is usually generated through some application of Newton's third ...

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GuidetoPropulsion
Mathematics

Unit Of Luminous Intensity (candela)

Originally, each country had its own, and rather poorly reproducible, unit of luminous intensity; it was necessary to wait until 1909 to see a beginning of unification on the international level, when ... Continue reading

Candela
Astronomy

Is There Weather In Space?

Space weather occurs in the area between the Earth and the Sun and refers to the disturbances and storms that swirl through space, which could have adverse effects on human activities. These ... Continue reading

SpaceWeather
Biology

What’s So Different About Ferns?

Most plants reproduce by producing a flower, then seeds. Anthers, considered the male reproductive structure, hold the pollen. The ovum, the female reproductive structure inside the flower, is ... Continue reading

Ferns
Biology

Life In The Extreme

Lowly microbes just may be the toughest living things on Earth. They have learned to survive, and indeed flourish, in the harshest environment imaginable, deep-sea rifts. These rifts are chains of ... Continue reading

Microbes

Is Heartburn a Heart Burn?

IsHeartburnaHeartBurnHeartburn is a bad name for a complaint that has nothing to do with the heart. TV ads call it acid indigestion. It's a burning sensation that begins under the breastbone and moves up into the throat. The pain may be at its worst when lying down or bending over. It may feel like bitter liquid rising into the throat or mouth. If it happens frequently, doctors call it GERD (for gastroesophageal reflux disease).

It happens when acid escapes back through the valve at the top of the stomach and moves up into the esophagus. Sixty million Americans say they get it at least once a month. Heartburn is common after a big meal, and some foods--such as tomato sauce, fried food, sour beverages, coffee, or soft drinks--trigger it in some people. It's more common among people who are overweight, smoke, or drink too much alcohol. It can be associated with a stomach ulcer or a hiatal hernia, which is a bulge of part of the stomach into the chest cavity. The hernia causes the stomach valve to work improperly.

Some people find they can avoid heartburn by watching what they eat and drink, learning to relax, and not eating two or three hours before bedtime. Over-the-counter antacids are effective for many. They make stomach acid less acid. When antacids fail, doctors recommend prescription drugs. In severe cases, a surgeon can stitch the stomach valve tighter, preventing the backup of acid.