CONCEPTS: city, leave, ship, sunset

GEN: a commercial cargo ship as it leaves a city at sunset

CONCEPTS: doctor, heart, stethoscope

GEN: young woman doctor listening its own heart with a stethoscope

CONCEPTS: begin, marathon, runner

GEN: A group of runners wait for the marathon to begin.

CONCEPTS: dome, life, simulate

GEN:
people just finished a yearlong experiment living inside a dome to simulate life .