FILE PHOTO The death of Freddie Gray in April 2015 sparked protests, with the effects still being felt today.
CLASS SCIENCE TEAM Ground was broken last spring at CLASS’s site in the Chilean desert.
LIGO The LIGO Livingston Observatory in Louisiana.
JPL An illustration of gravitational waves formed by two black holes orbiting each other at increasing speeds.
SOFYA FREYMAN/PHOTOGRAPHY STAFF Nearly 1,500 people lined up outside Shriver Hall, anticipating former NSA contractor Edward Snowden’s virtual discussion on privacy.
