245 Strong and fast hydrogel actuators
Plant cells inspire a hydrogel actuator that
achieves ultrastrong and fast actuation
By Z. Jiang and P. Song
REPORT p. 301246 Citizen science for studying
earthquakes
Seismologist-citizen partnership helped
understand the 2021 Haiti earthquake
By C. von Hillebrandt-Andrade and E. Vanacore
REPORT p. 283247 Complex regulation of fatty
liver disease
Hepatic lipogenesis is fine-tuned by
mechanistic target of rapamycin (mTOR)
signaling By H. N. Ginsberg and A. Mani
REPORT p. 264248 How the gut talks to the brain
Peptidoglycans from gut microbiota
modulate appetite through hypothalamic
circuits By A. Adamantidis
REPORT p. 263POLICY FORUM
250 Getting genetic ancestry right
for science and society
We must embrace a multidimensional,
continuous view of ancestry and move away
from continental ancestry categories
By A. C. F. Lewis et al.BOOKS E T A L.
253 Confronting climate injustice
Social, racial, and economic disparities are
crucial considerations in climate policies
PHOTO: LAUREN DECICCA By M. Aczel
SCIENCE science.orgNEWS
IN BRIEF
224 News at a glanceIN DEPTH
227 Global project gears up to study
vaccine safety
Pandemic propels international efforts to
understand incidence of rare side effects
By J. Couzin-Frankel228 Earth’s oldest land ecosystem
spotted in drilled cores
Campaign probes for earliest signs of
oxygen-producing life
B y P. Vo o s e n230 Thermal batteries could back up
green power
Efficiency jump in key component raises
hopes for storing renewable energy as heat
By R. F. Service231 How a site peddles author slots in
reputable publishers’ journals
Advertisements on Russian website promised
to add names to articles that appeared in
dozens of journals By D. Singh Chawla232 Bills to ease cannabis research
advance in U.S. Congress
Legislation may allow study of edibles or
let universities grow their own plants for
research By M. WadmanINSIGHTS
PERSPECTIVES
240 The fascinating world of
biogenic crystals
The diverse properties of these crystals may
lead to a variety of applications By J. Prywer
REPORT p. 312242 Fullerenes make copper
catalysis better
Ethylene glycol can be reliably produced
by mild hydrogenation of dimethyl oxalate
By E. Gravel and E. Doris
REPORT p. 288243 Regulatory CD8+ T cells
suppress disease
A subset of CD8+ T cells regulate chronic
inflammation by killing pathogenic CD4+ T
cells By A. Levescot and N. Cerf-Bensussan
REPORT p. 265CONTENTS
15 APRIL 2022
V O LU M E 3 7 6
ISSUE 659015 APRIL 2022 • VOL 376 ISSUE 6590 219233 Tiny labmade motors are poised
to do useful work
Molecular-scale pumps that mimic the
body’s miniature machines could clean air
and harvest precious metals By R. F. ServiceFEATURES
234 Looking for trouble
Trapping bats with Supaporn
Wacharapluesadee, who hunts for
viruses to understand and
prevent pandemic threats By J. Cohen234
Researchers in Thailand work late into the night to sample Rhinolophus bats that the team earlier found were infected with a virus related to SARS-CoV-2.