Science - USA (2020-07-10)

INSIGHTS

POLICY FORUM

134 How to build a more

open justice system

Court records are unstructured and costly to

access—here’s how to fix it By A. R. Pah et al.

PERSPECTIVES

137 Climate change tweaks

Arctic marine ecosystems

Nutrient input might enhance productivity

in the Arctic Ocean of the future By M. Babin

REPORT p. 198

FEATURES

130 No room for error

Developers of quantum computers face their

true challenge: taming the noise that plagues

the intertwined quantum bits By A. Cho

118 10 JULY 2020 • VOL 369 ISSUE 6500 sciencemag.org SCIENCE

ILLUSTRATION: ANDY GILMORE; PHOTO: MARTIN FORTIER/UNIVERSITÉ LAVAL

NEWS

IN BRIEF

122 News at a glance

IN DEPTH

124 U.K. megatrial outshines
other drug studies
Efficient recruitment and simple design are
key to Recovery trial’s success
By K. Kupferschmidt
PODCAST

125 Can interferons stop COVID-
before it takes hold?
Biology of infection supports early treatment
with body’s own viral defenses
By M. Wadman

127 UAE probe aims for Mars—
and payoffs on Earth
Even before launch, the Hope satellite has
boosted Emirati space science
By S. el-Showk

128 Polynesians, Native Americans
met and mingled long ago
Islanders’ DNA suggests contact before
European arrival By L. Wade

129 New security law rattles
Hong Kong universities
Researchers worry about academic freedom
and city’s ability to attract foreign talent
By D. Normile

138 Fuel cells that operate

at 300° to 500°C

High-conductivity electrolytes are needed for

electrochemical systems By M. Ni and Z. Shao

REPORT p. 184

140 Reining in dissolved

transition-metal ions

Approaches are needed for stabilizing

transition metals in lithium-ion battery

cathodes By H. Yaghoobnejad Asl and

A. Manthiram

142 Bats navigate with cognitive maps

Tagging and tracking systems reveal the way-

finding strategies of fruit bats By M. B. Fenton

REPORTS pp. 188 & 194

143 Exploring the source

of human brain fluids

Human organoid cultures can be used to

probe secretion and drug permeability into

and out of the brain

By V. Silva-Vargas and F. Doetsch

RESEARCH ARTICLE p. 159

144 Exercising your mind

A circulating factor induced by exercise

contributes to keeping the brain young

in mice By V. A. Ansere and W. M. Freeman

RESEARCH ARTICLE p. 167

145 Rigorous wildlife disease

surveillance

A decentralized model could address

global health risks associated with wildlife

exploitation By M. Watsa and Wildlife Disease

Surveillance Focus Group

CONTENTS

130

137 & 198

10 JULY 2020 • VOLUME 369 • ISSUE 6500