The Cannabis Question

September 29, 2021

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NOVA - S48 - E13

As state-legalized cannabis spreads, NOVA investigates the latest scientific evidence for its potential benefits and risks, and how criminalization has disproportionately harmed communities of color.

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NOVA: Season 48 - 25 Episode s

48x1 - Secrets in Our DNA
January 14, 2021
The value of DNA testing and the risks of entrusting this private data to commercial enterprises and online databases.
48x2 - Beyond the Elements: Reactions
February 3, 2021
Just about every solid, liquid, or gas in the world as we know it begins with reactions between individual atoms and molecules. Host David Pogue dives into the transformative world of chemical reactions, from the complex formula that produces cement to the single reaction that’s allowed farmers to feed a global population by the billions—a reaction that when reversed, unleashes the powerful chemistry of high explosives.
48x3 - Beyond the Elements: Indestructible
February 10, 2021
Women make up less than a quarter of STEM professionals in the United States, and numbers are even lower for women of color. But a growing group of researchers is exposing longstanding discrimination and making science more inclusive.
48x4 - Beyond the Elements: Life
February 17, 2021
Without the chemistry of photosynthesis, ozone, and a molecule called Rubisco, none of us would be here. So how did we get so lucky? To find out, host David Pogue investigates the surprising molecules that allowed life on Earth to begin, and ultimately thrive. Along the way, he finds out what we’re all made of—literally.
48x5 - Looking for Life on Mars
February 24, 2021
NASA launches its most ambitious hunt for traces of life on Mars, landing a car-sized rover in a rocky, ancient river delta. The rover will stow samples for possible return to Earth and test technology that may pave the way for human travel to Mars.
48x6 - Picture a Scientist/ Search Engine Breakdown
April 14, 2021
Women make up less than a quarter of STEM professionals in the United States, and numbers are even lower for women of color. But a growing group of researchers is exposing longstanding discrimination and making science more inclusive.
48x7 - Reef Rescue
April 21, 2021
Coral reefs are not just beautiful, they are also home to over a quarter of all marine life and are crucial to human societies around the globe. But as the climate changes and oceanic heat waves become commonplace, corals are bleaching and reefs are dying off. Now, marine biologists from across the world are teaming up to counteract this catastrophe with a technique called assisted evolution. Follow scientists as they attempt to crossbreed heat-resistant corals, and even transplant corals’ algae, in a race to save the coral reefs from extinction.
48x8 - Fighting for Fertility
May 12, 2021
What causes infertility, and how can assisted reproductive technologies help? Follow the journeys of people navigating fertility challenges from structural inequalities and racism to falling sperm counts, egg freezing, and IVF.
48x9 - Hindenburg: The New Evidence
May 19, 2021
80 years after the world’s largest airship ignited in a giant fireball, newly discovered footage sparks a reinvestigation of what exactly caused the Hindenburg disaster.
48x10 - Great Electric Airplane Race
May 26, 2021
Can new emission-free electric planes replace our polluting airliners and revolutionize personal transportation in our cities? NOVA takes you for a ride in some impressive prototypes that are already in the air, from speedy single-seat planes that can take off like a helicopter but are half as noisy to “self-flying” air taxis that are already taking passengers on test flights in Chinese cities. But if electric airplanes are ever to advance beyond small, short-haul craft, significant hurdles of battery weight, energy storage, and cooling remain to be overcome. How long will it be before the dream of super-quiet, super-efficient airliners becomes a reality?
48x11 - Ship That Changed the World
June 2, 2021
Five centuries ago, the Age of Exploration and Europe’s imperial colonization of far-off lands was launched by a revolution in ship design that made long-distance ocean voyages practical. But exactly how this momentous innovation happened eludes historians. Now, the excavation of a rare intact wreck discovered off the coast of Sweden offers vital new clues to a maritime mystery.
48x12 - Bat Superpowers
September 15, 2021
Bats have been implicated in deadly epidemics such as COVID-19 and Ebola, yet scientists are discovering evidence that they may hold a key to a longer and healthier life. From caves in Thailand and Texas to labs around the globe, NOVA meets the scientists who are decoding the superpowers of the bat.
48x13 - The Cannabis Question
September 29, 2021
As state-legalized cannabis spreads, NOVA investigates the latest scientific evidence for its potential benefits and risks, and how criminalization has disproportionately harmed communities of color.
48x14 - Particles Unknown
October 6, 2021
Outnumbering atoms a billion to one, neutrinos are the universe’s most common yet most elusive and baffling particle. NOVA joins an international team of neutrino hunters as they try to capture an elusive fourth form of neutrino. Their results may force scientists to redraw their blueprint of the subatomic world, the Standard Model of physics, and change our understanding of how the universe works.
48x15 - Arctic Drift
October 13, 2021
Join scientists on the most ambitious Arctic research expedition of all time. Experts from over twenty different nations join the voyage of the massive Polarstern icebreaker as it’s gripped by the polar ice and drifts for nearly an entire year. From this unique research station, they can make long-term observations and perform experiments in unprecedented detail. Facing hungry polar bears, perilous sea ice cracks, and brutal cold, the team strives to understand the forces that are changing the region—and the world—forever.
48x16 - Edible Insects
October 20, 2021
From crunchy crickets to nutty fly grubs, NOVA takes a tasty look at insect foods and how they could benefit our health and our warming planet. From Thailand to Texas, insect farmers are showing how the tiny critters stack up as an environmentally friendly alternative to beef protein and, pound for pound, deliver far better nutritional value than the finest steak. But will Americans overcome the “ick” factor and share the appetite of many cultures around the world for insect feasts?
48x17 - NOVA Universe Revealed: Age of Stars
October 27, 2021
The sun is our life-giving source of light, heat, and energy, and new discoveries are unraveling its epic history. Join NOVA on a spectacular voyage to discover the sun’s place in a grand cycle of birth, death and renewal that makes this the age of stars. Witness how stars of every size and color came to populate our universe; how stars stage a dramatic exit when they explode as supernovae, which can outshine an entire galaxy; and how, billions of years in the future, the age of stars will lead ultimately to an age of darkness.
48x18 - NOVA Universe Revealed: Milky Way
November 3, 2021
Straddling the night sky, the Milky Way reminds us of our place in the galaxy we call home. But what shaped this giant spiral of stars and what will be its destiny? NOVA travels back in time to unlock the turbulent story of our cosmic neighborhood, from its birth in a whirling disk of clouds and dust to colossal collisions with other galaxies. Finally, peer into the future to watch the Milky Way’s ultimate fate as it collides with the Andromeda galaxy, over 4 billion years from now.
48x19 - NOVA Universe Revealed: Alien Worlds
November 10, 2021
It’s an age-old question: are we alone? Or do other lifeforms and intelligences thrive on worlds far beyond our own? Ultra-sensitive telescopes and dogged detective work are transforming alien planet-hunting from science fiction into hard fact. Join NOVA on a visit to exotic worlds orbiting distant suns, from puffy planets with the density of Styrofoam to thousand-degree, broiling gas giants. Most tantalizing of all are the Super-Earths in the “Goldilocks zone,” just the right distance from their sun to support life, and with one of them signaling life’s essential ingredient, water, in its atmosphere. Are we on the brink of answering that haunting question?
48x20 - NOVA Universe Revealed: Black Holes
November 17, 2021
Take a seat on the ultimate thrill ride to explore nature’s strangest and most powerful objects. Black holes can reshape entire galaxies, warp the fabric of space and time, and may even be the key to unlocking the ultimate nature of reality. A new generation of high-energy telescopes is bringing these invisible voids to light, showing that “supermassives” millions or billions of times larger than our sun lurk at the center of nearly every galaxy, including our own. But what happens if you stray too close to one? And what lies beyond the black hole’s abyss? If nothing can ever escape it, is that the end of the story? Or could they be a portal to another dimension—or another universe, full of black holes?
48x21 - NOVA Universe Revealed: Big Bang
November 24, 2021
The Big Bang is when many think the universe started and time itself began. But what clues can we discover about this ultimate genesis of everything? And can we ever know what existed before the Universe’s birthday? With stunning animation based on space telescope images, NOVA explores infant galaxies filled with violent blue stars that formed just a few hundred million years after the Big Bang. Before that—before the coming of visible light itself—stretch the “cosmic Dark Ages.” But scientists haven’t stopped there; instead, they’ve come up with an incredible theory for what happened billionths of a billionth of a second from the universe’s birth. If they’re right, we’re on the brink of understanding more than we could ever have hoped about our cosmic origins.
48x22 - High-Risk High-Rise
January 5, 2022
Gleaming symbols of prestige, skyscrapers are an ingenious way to save space in dense urban areas. But even as we devise ways to defend them against fires, wind, and earthquakes, can we also make them more livable, interactive, and eco-friendly?
48x23 - Butterfly Blueprints
January 12, 2022
The hidden scientific secrets of butterflies reveal them to be more inventive and resilient than we ever imagined. Follow their extraordinary life cycle and migrations to tropical rainforests, windswept prairies, and even inside a chrysalis as it’s being spun.
48x24 - Alaskan Dinosaurs
January 19, 2022
A team of intrepid paleontologists discovers that dinosaurs thrived in the unlikeliest of places—the cold and dark of winter in the Arctic Circle. How did they survive year-round and raise their young in frigid and dark winter conditions?
48x25 - Ancient Maya Metropolis
January 26, 2022
The ancient ancestors of today’s Maya people thrived in large sophisticated cities across Central America for centuries. Why, around 750 CE, did they begin to abandon many of their major cities? Archaeologists investigate dramatic new evidence of the catastrophic droughts and instability that pushed cities beyond their limits.

48x1 - Secrets in Our DNA

48x2 - Beyond the Elements: Reactions

48x3 - Beyond the Elements: Indestructible

48x4 - Beyond the Elements: Life

48x5 - Looking for Life on Mars

48x6 - Picture a Scientist/ Search Engine Breakdown

48x7 - Reef Rescue

48x8 - Fighting for Fertility

48x9 - Hindenburg: The New Evidence

48x10 - Great Electric Airplane Race

48x11 - Ship That Changed the World

48x12 - Bat Superpowers

48x13 - The Cannabis Question

48x14 - Particles Unknown

48x15 - Arctic Drift

48x16 - Edible Insects

48x17 - NOVA Universe Revealed: Age of Stars

48x18 - NOVA Universe Revealed: Milky Way

48x19 - NOVA Universe Revealed: Alien Worlds

48x20 - NOVA Universe Revealed: Black Holes

48x21 - NOVA Universe Revealed: Big Bang

48x22 - High-Risk High-Rise

48x23 - Butterfly Blueprints

48x24 - Alaskan Dinosaurs

48x25 - Ancient Maya Metropolis

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