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Ask 10 people what makes humans human and you’ll probably get 10 different answers — and then some.
Jumping genes have been a powerful force in human evolution.
A dynasty may have risen from the dead in an ancient Chaco great house.
Excess gamma rays are still unexplained, but they might not come from dark matter.
Mars formed farther away from the sun than its present-day orbit, not near the other terrestrial planets, new research suggests.
People’s injury patterns today can’t explain how Neandertals got so many head wounds.
Oxidizing tiny iron particles from the inside out reveals how oxidation works and could offer new vehicles for drugs or energy.
A gene helps nerve cell axons extend to parts of the brain to deliver serotonin, a brain chemical associated with depression.
Copper Age Iceman froze to death, with shoulder and head damage.
Particles in quantum superposition adhere to the equivalence principle in atomic test.
DNA from ancient horses reveals early domestication involved plenty of stallions.
A new look at marine Trichodesmium microbes suggests trouble for nitrogen fixation in an acidifying ocean.
Mastodon site suggests first Americans arrived unexpectedly early.
Ancient groundwater that is thousands of years old is still susceptible to modern pollution, new research suggests.
A device can keep premature lambs alive for a month in womblike conditions.
The bubble that envelops the planets and other material in the solar system does not have a tail, new observations show.
Immune system cells called macrophages help heart cells rhythmically contract, maintaining the beat of mice’s hearts.
An 180-kilometer-long rift in Antarctica’s Larsen C ice shelf has forked into two branches, new satellite observations show.
For the first time, biologists have pinpointed the compound that lights up in fungal bioluminescence.
Zika virus sticks around in the central nervous system and lymph nodes of monkeys.
Chinese finds offer earliest look at game-changing weaving machine.
Unlike snakes, blennies evolved fangs before venom, through probably not because of any need to hunt big prey.
Scientists now rely on spacecraft to chart the intricate rings of the gas giant.
The melting of one of Canada’s largest glaciers has rerouted meltwater from one stream into another in an instance of river piracy.
The behavior, called social parasitism, has been going on for about 100 million years.
Reviews & Previews
“Us and Them,” a new exhibit at the Musée de l’Homme in Paris, draws on genetics, psychology, anthropology and sociology to examine why racism and prejudice persist.
Letters to the Editor
Readers sent feedback on cellular slip-ups, moon mayhem and more.
The most detailed atlas of the seafloor ever compiled offers colorful imagery and ghostly glimpses of Earth’s glacial past.