Ocean Invaders

October 26, 2022

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NOVA - S49 - E15

Lionfish–long prized in home aquariums–have invaded the Atlantic, and are now one of the ocean’s most successful invasive species, wreaking havoc in waters across the globe. Join ocean explorer Danni Washington on a journey to find out how they took over, why they’re doing so much damage, and what can be done about it.

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NOVA: Season 49 - 19 Episode s

49x1 - Arctic Sinkholes
February 2, 2022
In the Arctic, enormous releases of methane, a potent greenhouse gas, threaten the climate.
49x2 - Secrets in the Scat
February 9, 2022
Scott Burnett is “Scatman”—an Australian ecologist on the trail of the secrets of poop. By identifying and analyzing animal scat for DNA and hormones, he discovers essential details of their behavior, how they fit in the ecosystem, and even how to protect them.
49x3 - Great Mammoth Mystery
February 16, 2022
Sir David Attenborough investigates a unique site in southern England where amateur fossil hunters uncovered giant mammoth bones and evidence of Neanderthals. A team of paleontologists and archaeologists soon discover that the site preserves rare evidence of the extinct beasts and early human inhabitants of Britain dating to over 200,000 years ago.
49x4 - Augmented
February 23, 2022
Follow the dramatic personal journey of Hugh Herr, a biophysicist working to create brain-controlled robotic limbs. At age 17, Herr’s legs were amputated after a climbing accident. Frustrated by the crude prosthetic limbs he was given, Herr set out to remedy their design, leading him to a career as an inventor of innovative prosthetic devices.
49x5 - Determined: Fighting Alzheimer's
April 6, 2022
Follow three women at risk of developing Alzheimer’s as they join a groundbreaking study to try to prevent the disease – sharing their ups and downs, anxiously watching for symptoms, and hoping they can make a difference.
49x6 - Dinosaur Apocalypse: The New Evidence
May 11, 2022
In the Badlands of North Dakota, a team of scientists think they might have found the fossilized remains of animals killed on the day an asteroid struck Earth 66 million years ago. The evidence points to a catastrophic event, with a jumble of rare fossils, including a pterosaur embryo still in its shell and a well-preserved patch of triceratops skin, mixed in with tiny spheres of clay and glass that could be the fallout from the massive asteroid impact. Sir David Attenborough guides us on a search for clues that could give an unprecedented snapshot of what happened in the dinosaurs’ final moments on Earth.
49x7 - Dinosaur Apocalypse: The Last Day
May 11, 2022
In the second episode of this two-part series, the search continues for signs of what happened on the day the dinosaurs died. Scientists uncover extremely rare fossils and more evidence that could link the dig site in North Dakota to the asteroid that wiped out the dinosaurs 66 million years ago. Among the fossils are tiny spheres of glass locked in amber. Inside one of the spheres is a speck of rock that appears to be a chemical match to the killer asteroid itself. And scientists uncover one of the most spectacular finds of all: an almost perfectly preserved dinosaur leg. Sir David Attenborough guides us on a search for clues that could provide an unprecedented snapshot of what happened in the dinosaurs’ final moments on Earth.
49x8 - Why Ships Crash
May 18, 2022
When the bow of the colossal Ever Given container ship plowed into the bank of the Suez Canal on March 23, 2021, international supply chains ground to a halt. What went wrong? Follow the dramatic efforts to free the ship and the investigation into one of the most expensive shipping disasters ever. Maritime experts analyze other recent accidents and try to figure out how such devastating crashes could be prevented.
49x9 - Ice Age Footprints
May 25, 2022
Thousands of ancient footprints stretch for miles across New Mexico’s White Sands National Park, capturing moments when Ice Age humans encountered now-extinct beasts, including mammoths and enormous ground sloths. These footprints tell an intimate story about what life was like during the Ice Age and reveal surprising new evidence about when humans arrived in North America.
49x10 - Ultimate Space Telescope
July 13, 2022
How did NASA engineers build and launch the most ambitious telescope of all time? Follow the dramatic story of the James Webb Space Telescope—the most complex machine ever launched into space. If it works, scientists believe that this new eye on the universe will peer deeper back in time and space than ever before to the birth of galaxies, and may even be able to “sniff” the atmospheres of exoplanets as we search for signs of life beyond Earth. But getting it to work is no easy task. The telescope is far bigger than its predecessor, the famous Hubble Space Telescope, and it needs to make its observations a million miles away from Earth—so there will be no chance to go out and fix it. That means there’s no room for error; the most ambitious telescope ever built needs to work perfectly. Meet the engineers making it happen and join them on their high stakes journey to uncover new secrets of the universe.
49x11 - Saving Venice
September 28, 2022
Rising seas and sinking land threaten to destroy Venice. Can the city’s new hi-tech flood barrier save it? Discover the innovative projects and feats of engineering designed to stop this historic city from being lost to future generations.
49x12 - Ending HIV in America
October 5, 2022
Almost 40 years after the discovery of HIV, could we be on the verge of ending the AIDS epidemic in America? How did scientists tackle one of the most elusive deadly viruses to ever infect humans? Can innovative drugs bring new infections to zero?
49x13 - Computers v. Crime
October 12, 2022
In police departments and courts across the country, artificial intelligence is being used to help decide who is policed, who gets bail, how offenders should be sentenced, and who gets parole. But is it actually making our law enforcement and court systems fairer and more just? This timely investigation digs into the hidden biases, privacy risks, and design flaws of this controversial technology.
49x14 - Can Psychedelics Cure?
October 19, 2022
Hallucinogenic drugs—popularly called psychedelics—have been used by human societies for thousands of years. Today, scientists are taking a second look at many of these mind-altering substances – both natural and synthetic – and discovering that they can have profoundly positive clinical impacts, helping patients struggling with a range of afflictions from addiction to depression and PTSD.
49x15 - Ocean Invaders
October 26, 2022
Lionfish–long prized in home aquariums–have invaded the Atlantic, and are now one of the ocean’s most successful invasive species, wreaking havoc in waters across the globe. Join ocean explorer Danni Washington on a journey to find out how they took over, why they’re doing so much damage, and what can be done about it.
49x16 - Nazca Desert Mystery
November 2, 2022
One of the world’s greatest ancient enigmas, the Nazca lines are a dense network of criss-crossing lines, geometric shapes, and animal figures etched across 200 square miles of Peruvian desert. Who created them and why? Ever since they were rediscovered in the 1920s, scholars and enthusiasts have raised countless theories about their purpose.
49x17 - Crypto Decoded
November 9, 2022
From Bitcoin to NFTs, crypto is making headlines. But what exactly is it, and how does it work? Experts go beyond the hype and skepticism to unravel the social and technological underpinnings of crypto – exploring how it came to be and why this new technology may change more than just money.
49x18 - Zero to Infinity
November 16, 2022
Discover how the concepts of zero and infinity revolutionized mathematics.
49x19 - Rebuilding Notre Dame
December 14, 2022
In April 2019, the world watched as a devastating fire almost destroyed Paris’s iconic Notre Dame Cathedral. Go behind the scenes with a team of engineers, masons, and timber workers tackling the daunting challenges of restoring the historic landmark.

49x1 - Arctic Sinkholes

49x2 - Secrets in the Scat

49x3 - Great Mammoth Mystery

49x4 - Augmented

49x5 - Determined: Fighting Alzheimer's

49x6 - Dinosaur Apocalypse: The New Evidence

49x7 - Dinosaur Apocalypse: The Last Day

49x8 - Why Ships Crash

49x9 - Ice Age Footprints

49x10 - Ultimate Space Telescope

49x11 - Saving Venice

49x12 - Ending HIV in America

49x13 - Computers v. Crime

49x14 - Can Psychedelics Cure?

49x15 - Ocean Invaders

49x16 - Nazca Desert Mystery

49x17 - Crypto Decoded

49x18 - Zero to Infinity

49x19 - Rebuilding Notre Dame

S0: Specials

S1: Season 1

S2: Season 2

S3: Season 3

S4: Season 4

S5: Season 5

S6: Season 6

S7: Season 7

S8: Season 8

S9: Season 9

S10: Season 10

S11: Season 11

S12: Season 12

S13: Season 13

S14: Season 14

S15: Season 15

S16: Season 16

S17: Season 17

S18: Season 18

S19: Season 19

S20: Season 20

S21: Season 21

S22: Season 22

S23: Season 23

S24: Season 24

S25: Season 25

S26: Season 26

S27: Season 27

S28: Season 28

S29: Season 29

S30: Season 30

S31: Season 31

S32: Season 32

S33: Season 33

S34: Season 34

S35: Season 35

S36: Season 36

S37: Season 37

S38: Season 38

S39: Season 39

S40: Season 40

S41: Season 41

S42: Season 42

S43: Season 43

S44: Season 44

S45: Season 45

S46: Season 46

S47: Season 47

S48: Season 48

S49: Season 49

S50: Season 50

S51: Season 51