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A study challenged the evidence for the mysterious antigravitational force known as dark energy. Then cosmologists shot back.

An organized tide of brain waves, blood and spinal fluid pulsing through a sleeping brain may flush away neural toxins that cause Alzheimer’s and other diseases.

Exploring Howard Nemerov’s poem, “Learning the Trees.”

For the first time, physicists have calculated exactly what kind of singularity lies at the center of a realistic black hole.

Physicists have long searched for hypothesized dark matter particles called WIMPs. Now, focus may be shifting to the axion — an ultra-lightweight particle whose existence would solve two mysteries at once.

Experiments on snails and other creatures raise questions about how memories are really stored.