Science - USA (2020-01-03)

CREDITS (FROM TOP): (IMAGE) V. P. PATIL

ET AL.

; (PHOTO) SCIENCE HISTORY IMAGES/AL AMY STOCK PHOTO; (PHOTO) TONY HEALD/MINDEN PICTURES

SCIENCE sciencemag.org 3 JANUARY 2020 • VOL 367 ISSUE 6473 3

3 JANUARY 2020 • VOLUME 367 • ISSUE 6473

CONTENTS

71

What makes

knots tight?

NEWS

IN BRIEF

6 What’s coming up in 2020

PODCAST

IN DEPTH

9 U.S. military tests radiation belt

cleanup in space

Radio waves could sweep belts clean

of satellite-killing particles after nuclear

sneak attack By R. Stone

10 Past megadroughts hit North

and South America in tandem

Strong La Niña conditions drove

deep medieval droughts B y P. Vo o s e n

11 Study pushes emergence of measles

back to antiquity

The virus may have entered the human

population when cities grew large enough to

sustain outbreaks By K. Kupferschmidt

12 Computer scientist in line to

become next NSF director

Sethuraman Panchanathan would

succeed France Córdova By J. Mervis

INSIGHTS

BOOKS E T A L.

20 Asimov at 100

From epic space operas to rules for

robots, the prolific author’s literary

legacy endures By J. Gunn

PERSPECTIVES

22 Uncovering the ART of antimalarial

resistance

A key mechanism of resistance to the

antimalarial drug artemisinin is identified

By D. Marapana and A. F. Cowman

RESEARCH ARTICLE p. 51

23 Majorana fermions go for a ride

Evidence for propagating Majorana

quasiparticles is found

in a topological superconductor

By S. Tewari and T. D. Stanescu

REPORT p. 104

24 Building a carnivorous trap

Experiments and computations reveal

developmental origins of cup-shaped leaves

By D. E. Moulton and A. Goriely

REPORT p. 91

13 Congress again rejects Trump cuts,

smiles on science agencies

2020 spending bill increases research

budgets, but next year will be tougher as

lawmakers will have less to spend

By J. Merivs

14 Global polio eradication falters

in the final stretch

Vaccine-derived outbreaks may force a

change in “endgame” strategy By L. Roberts

FEATURES

16 Fighting words

Virologist Roberto Burioni has become a

celebrity in Italy by sparring with vaccine

skeptics By D. Starr

6

9

Afterglow of a 1962 nuclear test in space

Published by AAAS