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  Health

  Walking 3,000-5,000 steps a day may delay Alzheimer’s

  Findings could explain why some older adults at risk for the disease decline faster than others

  

  4 min read

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  Nation & World

  Cold War arms-control pioneers perhaps weren’t peacemakers we thought they were 

  Nuclear-age historian argues scientists who backed arsenals as deterrent aided military-industrial complex, hampered disarmament

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  Science & Tech

  Salamanders can regrow limbs. Could humans someday?

  Findings on adrenaline’s role in process raise new possibilities for regenerative medicine

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