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All Stories by John Pickrell
New genetic evidence suggests that crabs aren't all close relatives and their characteristic shape evolved independently on numerous occasions.
Health & Medicine
Researchers are enlisting a person's own immune system to attack prostate tissue, including cancerous cells.
A new study of lynx in North America suggests the animals interbreed widely, sometimes with populations thousands of kilometers away.
Fear of bioterrorism has led the World Health Organization to postpone its 2002 deadline for destruction of smallpox virus stocks so that scientists can refine current vaccines and improve defenses against the disease.