ScienceIQ.com

Somewhere Over Which Rainbow?

How many rainbows are there really when we only see one during a rainstorm? The answer isn't as simple as you might think! Rainbows are formed when light enters a water droplet, reflects once inside the droplet, and is reflected back to our eyes. Each raindrop reflects and refracts the light that enters it in all possible ways. When light first ...

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DoubleRainbow
Astronomy

X-ray Emissions From Comets

The X-ray emission from comets is produced by high-energy particles, but the high-energy particles come not from the comet but from the sun. Matter is continually evaporating from the solar corona in ... Continue reading

XrayEmissionsComets
Biology

We Live In Two Distinct Visual Worlds

Have you ever wondered what it would be like to live on a planet where all the colors were different from what you're used to? Actually, you already have a lot of experience with two different worlds ... Continue reading

VisualWorlds
Geology

The Importance Of Clouds And Aerosols To Climate Change

Everything, from an individual person to Earth as a whole, emits energy. Scientists refer to this energy as radiation. As Earth absorbs incoming sunlight, it warms up. The planet must emit some of ... Continue reading

CloudsAerosols
Medicine

Civets Lesson

Recently a Chinese television producer fell ill with Severe Acute Respiratory Syndrome, better known as SARS. He is the first victim in many months, although an epidemic last year claimed nearly 8000 ... Continue reading

CivetsLesson

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.