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19567
Why slam a copper impactor into Comet Tempel 1? Wouldn’t copper vapor contaminate the spray? Why not a high-temperature ceramic? P.M. deLaubenfelsCorvallis, Ore. According to Casey Lisse of the Deep Impact team, copper was chosen because its density put a lot of mass into a small package, its relative softness reduced bounce at impact, and […]
- Planetary Science
A Grand Slam
A 372-kilogram copper projectile released from NASA's Deep Impact spacecraft successfully slammed into Comet Tempel 1 on July 4, producing some heavenly fireworks.
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- Health & Medicine
Epilepsy surgery stands test of time
Brain surgery for people with severe epilepsy keeps many of these patients free of seizures for decades.
- Animals
More junk makes for better dads
A new analysis links dutiful fatherhood in prairie voles to a stretch of DNA once dismissed as meaningless.
- Astronomy
Rumblings from a dead star
The burned-out cinder left behind when a massive Milky Way star exploded recently underwent its own outburst.
- Tech
A nanoprinter for cheaper diagnostics
Using strands of DNA as movable type, scientists have created a miniaturized printing technique for mass-producing medical diagnostic chips.
- Health & Medicine
Stem cell shift may lead to infections, leukemia
Aging of blood-producing stem cells could be responsible for the relatively high incidence of infections and myeloid leukemia in the elderly.
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19566
I have experienced sleep paralysis in almost all of its forms, from terrors to vibrations and auditory hallucinations to out-of-body experiences. Most often it is completely terrifying, but I did have one episode that was elating. Sweet dreams. Kathleen MilroyOntario, Canada The manifestations reported by sufferers of sleep paralysis are eerily similar to the visitation […]
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Night of the Crusher
Sleep paralysis, a kind of waking nightmare experienced by people in all cultures, sometimes plays a key role in post-traumatic stress disorder and panic attacks and contributes to widespread beliefs in various spirits and supernatural beings.
- Earth
Volcanic Hot Spots
Many geophysical studies, including analyses of deep-traveling seismic waves and computer simulations of flowing molten rock deep beneath Earth's crust, are providing evidence that mantle plumes actually exist.
- Humans
From the June 29, 1935, issue
Science and engineering in a photo-mural, organs grown outside the body, and inexpensive air conditioning.
