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Reaching for the Multiverse
Infinity and Beyond: The Ultimate Test

Multiverse Collisions May Dot the Sky

Early in cosmic history, our universe may have bumped into another — a primordial clash that could have left traces in the Big Bang’s afterglow.

Infinity and Beyond: The Ultimate Test

In a Multiverse, What Are the Odds?

Testing the multiverse hypothesis requires measuring whether our universe is statistically typical among the infinite variety of universes. But infinity does a number on statistics.

astrophysics

Dwarf Galaxies Dim Hopes of Dark Matter

For five years physicists have been tantalized by possible evidence of dark matter in the Milky Way’s center. But new results from small satellite galaxies have complicated the story.

neuroscience

Mental Leaps Cued by Memory’s Ripples

The same mental processes that organize memories may also coordinate how we make decisions.

statistical physics

At the Far Ends of a New Universal Law

A potent theory has emerged explaining a mysterious statistical law that arises throughout physics and mathematics.

neuroscience

Brain’s Positioning System Linked to Memory

The 2014 Nobel Prize in Physiology or Medicine was awarded to three researchers who discovered how the brain navigates the world. Their work may also help illuminate how the mind stores memories.

biology

Elusive Form of Evolution Seen in Spiders

A study of diverse colonies of spiders supports a controversial idea in evolution — that natural selection can act on communities as well as on individuals.

Ships Docking
ecology

Lizard Stowaways Revise Principle of Ecology

The movement of lizards around the Caribbean is forcing researchers to account for human activity in even their most basic ecological models.

BICEP2 graphic.
cosmology

‘Big Bang Signal’ Could All Be Dust

Cosmic dust in the high latitudes of the Milky Way could account for the entire swirl pattern that had been presented as proof of a leading Big Bang theory, according to a new data analysis from the Planck satellite.