PBS NewsHour

Genetics, climate change, space mark the year in science

Clip: 12/20/2018 | 7m 56s | Video has closed captioning.

The year has been a major one for scientific milestones and research. As it comes to a close, we take a look back at some of the biggest science stories, for our weekly series the Leading Edge. Miles O’Brien and William Brangham discuss developments in the genetic engineering of humans, the realization of climate change’s immediate impact on weather and a new era of space exploration.