Contents

12 April 2019
Vol 364, Issue 6436

About The Cover

Cover image expansion

COVER A study of identical twins identifies molecular, physiological, and cognitive changes specific to one twin who spent a year living aboard the International Space Station. The cover depicts the twins and their respective Earth-bound and space residencies, with a rocket and the International Space Station in the background. See pages 127 and eaau8650.
Illustration: Ray Oranges @ Machas