Scientific American - USA (2022-04)

April 2022, ScientificAmerican.com 1

April 2022

VOLUME 326, NUMBER 4

Photograph by Jelle Wagenaar

ON THE COVEr

Every year billions of birds travel long distances

between their breeding and wintering grounds.

Scientists have known for a while that they use

the sun and stars to navigate. But birds also

use Earth’s magnetic field to orient themselves.

New research suggests that their magnetic

compass relies on quantum physics.

illustration by Kyle Bean.

40

BIOPHYSICAL CHEMISTRY

26 The Quantum Nature

of Bird Migration

Migratory birds travel vast distances

between their breeding and

wintering grounds. New research

hints at the biophysical under­

pinnings of their internal naviga­

tion system. By Peter J. Hore and

Henrik Mouritsen

ASTRONOMY

32 Women Take On the Stars

A new wave of astronomers are

leading a revolution in scientific

culture. By Ann Finkbeiner

ENVIRONMENT

40 Creek Revival

Radical reconstruction in Seattle

is  bringing nearly dead urban

streams back to productive life.

By Erica Gies

HISTORY OF SCIENCE

50 Mysterious Butterflies

of the Soul

Santiago RamÓn y Cajal, the

discovery of neurons and the

origins of modern brain science.

By Benjamin Ehrlich

ASTROPHYSICS

58 Scanning the Cosmos

for Dark Matter

Signals from space may point the

way to the universe’s hidden realm.

By Chanda Prescod-Weinstein

ARCHAEOLOGY

66 The New Archaeology

of Jerusalem

Even as biblical archaeology gets

a high­tech makeover, a new gener­

ation of scholars remain haunted

by ancient scripture and riven by

modern politics. By Andrew Lawler

PSYCHOLOGY

74 Nap Like a Genius

Thomas Edison jolted himself from

the edge of sleep to boost creativity.

His method can work for the rest of

us, research indicates. By Bret Stetka

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