Back to Show
NOVA
How Wildfires and Ozone Led to Terrible Air Quality
During summer 2021, cities like New York and Sacramento reported higher-than-normal air pollution — with Denver on Aug. 7 reporting the worst air quality in the world.
Support Provided By
Season
Unlock with PBS Passport
53:22
What exactly is crypto, and how does it work? This technology is more than just money.
53:31
Who created the Nazca lines and why? New clues to one of the greatest ancient enigmas.
Unlock with PBS Passport
53:32
Meet one of the ocean’s most beautiful and destructive species: Lionfish.
53:47
Psychedelics are unlocking new ways to treat conditions like addiction and depression.
53:30
Is artificial intelligence making policing and courts fairer, or is it increasing bias?
53:30
A team tackles the restoration of iconic Notre Dame Cathedral.
Unlock with PBS Passport
53:31
Can innovative engineering projects save Venice?
53:33
Can innovative drugs and therapies finally end HIV?
53:33
Discover how NASA engineers built and launched the most ambitious telescope of all time.
53:21
Ancient footprints provide new evidence of humans and extinct giant beasts of the Ice Age.
53:20
How could a single ship cause a major supply chain crisis around the globe?
53:28
Follow three women enrolled in a new study to try to prevent Alzheimer’s.