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ArchaeologyStone tools put early hominids in China 2.1 million years ago
Newly discovered stone tools in China suggest hominids left Africa 250,000 years earlier than we thought.
By Bruce Bower -
EcosystemsBird poop helps keep coral reefs healthy, but rats are messing that up
Eradicating invasive rats from islands may help boost numbers of seabirds, whose droppings provide nutrients to nearby coral reefs.
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Particle PhysicsReaders ask about proton pressure, wearable tech and more
Readers had questions about the pressure inside a proton, wearable tech safety and the effects of global warming on insects.
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Science & SocietyIn research, detours are a key part of discovery
Editor in Chief Nancy Shute discusses the scientific process and the often contradictory research about Alzheimer's disease.