Pot may be good and bad, researchers propose:
The truth about marijuana might be more complex than either its opponents or its champions suggest, some scientists argue.
We're more genetically diverse than thought:
Research has found that at least one in 10 human genes vary in the number of copies of certain DNA sequences.
A step toward quantum computers:
Physicists say they've taken a step toward making computers that work at blinding speeds thanks to the weird realities of quantum physics.
One cell makes almost any heart tissue, study finds:
New research could be a stride forward for therapy to rebuild hearts, but its use of embryonic cells may stir controversy.
Molecules may 'anchor' memories in brain:
Our brains nail down memories by using special proteins as anchors, a study suggests.
Extreme black hole pushes spin 'limit':
A black hole's blindingly fast rotation could help explain some strange phenomena, physicists say.
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