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  1. Science & Society

    Cancer studies get mixed grades on redo tests

    Replications of cancer studies fail to reproduce some results.

    By Tina Hesman Saey
  2. Climate

    Monsoon deluges turned ancient Sahara green

    The ancient Sahara Desert sprouted trees and lakes for thousands of years thanks to intense rainfall.

    By Bruce Bower
  3. Climate

    For three years in a row, Earth breaks heat record

    Spurred by climate change and heat from a strong El Niño, 2016 was the hottest year on record.

    By Thomas Sumner
  4. Tech

    Heart-hugging robot does the twist (and squeeze)

    A robotic sleeve that slips around the heart mimics the heart’s natural movement, squeezing and twisting to pump blood in pigs.