March 2021, ScientificAmerican.com 1March 2021VOLUME 324, NUMBER 300
ON ThE cOVEr
A Black Lives Matter protest last August
at the National Mall in Washington, D.C.,
honored the 57th anniversary of the historic
March on Washington during the Civil Rights
Movement. Successful movements require
organization, strategy, and material and cultural
resources that largely emanate from within
the community experiencing injustice.
Photograph by Mel D. Cole.58
SOCIOLOGY
24 The Power of Social
Justice Movements
Black Lives Matter takes the baton
from the Civil Rights Movement.
By Aldon Morris
ASTRONOMY
38 Alien Moons
The race is on to discover the first
moon orbiting a planet beyond
our solar system. By Rebecca Boyle
PSYCHOLOGY
46 Coping with
Pandemic Stress
The yearlong COVID-19 crisis
has taken a terrible mental
health toll. Coping methods
based in disaster and trauma
psychology can help.
By Melinda Wenner MoyerCONSERVATION
52 100 Years of Bird Banding
A rich archive of data illuminates
the secret lives of birds.
By Kate Wong, Jan Willem Tulp
and Liz Wahid
PLANETARY SCIENCE
58 The Curious Science
of Chondrules
With material from the asteroid
Ryugu, scientists may finally dis-
cover the origin of these enigmat-
ic objects—and what they tell us
about the birth of the solar system.
By Jonathan O’Callaghan
ARCHAEOLOGY
66 The Origin of Home
A 9,000-year-old city reveals life as
it was when people first started put-ALFRED PASIEKA ting down roots. By Annalee Newitz
Science Source