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Smoke Detectors

How does a smoke detector 'know' when there is a fire? Smoke detectors use one of two different methods to do their job, and for both methods the basic operating assumption is the cliche 'where there's smoke there's fire'. Smoke is of course, essential to the operation of a smoke detector, and it is the physical interaction of smoke particles with ...

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SmokeDetectors
Biology

Bacteria Sometimes Catch A Virus

Bacteria sometimes catch a virus. Bacteriophages--'bacteria-eaters'-- or phages, are viruses that use bacteria to multiply. The phage attaches to a bacterium, injects its own genetic material, either ... Continue reading

BacteriaSometimesCatchAVirus
Geology

The San Andreas Fault

Scientists have learned that the Earth's crust is fractured into a series of 'plates' that have been moving very slowly over the Earth's surface for millions of years. Two of these moving plates meet ... Continue reading

TheSanAndreasFault
Astronomy

N81

NASA's Hubble Space Telescope has taken a 'family portrait' of young, ultra-bright stars nested in their embryonic cloud of glowing gases. The celestial maternity ward, called N81, is located 200,000 ... Continue reading

N81
Biology

What Makes Those Jumping Beans Jump?

Mexican jumping beans intrigue us because we don't understand how this inanimate object could actually jump, even though we see it with our own eyes. It is the question everyone wonders when they see ... Continue reading

WhatMakesThoseJumpingBeansJump

The Neurological Complications Of Lyme Disease

LymeDiseaseLyme disease is caused by a bacterial organism that is transmitted to humans via the bite of an infected tick. Most people bitten by an infected tick develop a characteristic skin rash around the area of the bite. The rash may feel hot to the touch, and vary in size, shape, and color, but it will often have a “bull’s eye” appearance (a red ring with a clear center). However, there are those who will not develop the rash, which makes Lyme disease hard to diagnose because its symptoms and signs mimic those of many other diseases. Seven to 10 days following an infected tick’s bite, the first stage of Lyme disease begins with flu-like symptoms such as fever, chills, swollen lymph nodes, headaches, fatigue, muscle aches, and joint pain.

Neurological complications most often occur in the second stage of Lyme disease, with numbness, pain, weakness, Bell’s palsy (paralysis of the facial muscles), visual disturbances, and meningitis symptoms such as fever, stiff neck, and severe headache. Other problems, which may not appear until weeks, months, or years after a tick bite, include decreased concentration, irritability, memory and sleep disorders, and nerve damage in the arms and legs. Lyme disease is treated with antibiotics under the supervision of a physician.

Most individuals with Lyme disease respond well to antibiotics and have full recovery. In a few patients symptoms of persisting infection may continue or recur, requiring additional antibiotic treatment. Varying degrees of permanent joint or nervous system damage may develop in patients with late chronic Lyme disease. In rare cases, some individuals may die from Lyme disease and its complications.