5,015 results
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Tailoring Therapies: Cloned human embryo provides stem cells
Scientists have for the first time carried test-tube cloning of a human embryo to the stage at which it can yield stem cells.
- Earth
POPs treaty enacted
A new United Nations treaty that seeks to phase down or eliminate production and use of 16 persistent, toxic pollutants has gone into effect.
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Heat-Seeking Missiles: Sperm may follow rising temperature to egg
In a process called thermotaxis, sperm cells may use a temperature gradient in the fallopian tubes to find their way to an unfertilized egg.
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Widows show third-year rebound
Women whose husbands die largely overcome their grief-related problems, including depression and social isolation, by about 3 years after their loss, according to a national study.
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To Err Is Human
Two researchers have issued a blunt critique of what they see as a misguided emphasis on immoral behaviors and mental flaws in many social psychology studies.
- Tech
Smart dust can swarm target
Microscopic mirrors can swarm a target and produce an optical signal that identifies the target to the observer.
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Quite a Switch
Cells use ribonucleic acids that bind to small molecules such as vitamins to control gene activity.
- Agriculture
Fishy Alpha Males
As a way to protect wild fish stocks, raising genetically engineered fish may be futile should some of these modified fish escape into the environment.
- Chemistry
Secret of strong silk
By controlling the amount of water in their glands, spiders and silkworms prevent their silk proteins from crystallizing prematurely.
- Humans
Science News of the Year 2000
A review of important scientific achievements reported in Science News during the year 2000.
- Health & Medicine
No Scope: CT scan works as well as colonoscopy
A computed tomography scan of the large intestine works as well as colonoscopy in detecting signs of colon cancer.
- Materials Science
Diatom Menagerie
Materials scientists are trying to coerce diatoms into making silicon-based microdevices with specific features.
