Use one of the services below to sign in to PBS:
tried to add this video to your Watchlist so you can watch
it later. But first, we need you to sign in to PBS using one
of the services below. You’ll be able to manage
videos in your Watchlist, keep track of your favorite shows,
watch PBS in high definition, and much more!
tried to select this program as one of your favorites. But
first, we need you to sign in to PBS using one of the
services below. You’ll be able to manage videos in
your Watchlist, keep track of your favorite shows, watch PBS
in high definition, and much more!
To get you
watching PBS in high definition we need you to sign in to
PBS using one of the services below. You'll be able
to manage videos in your Watchlist, keep track of your
favorite shows, watch PBS in high definition, and much more!
Don’t have a PBS Account? Create one nowCreate a PBS account
Already a CET member? You may have an unactivated CET Passport member benefit. Check to see.
What is CRISPR gene editing?
Scientists have a new tool to edit genes in human cells to repair mutations. What is it?
Clip: S44 | 1m 24s
Share this video:
Share this video on FacebookFacebookShare this video on TwitterTwitter
How Fast Does Santa Fly?
To make their delivery schedule, how quickly must Santa and his reindeer travel the world?
Clip: S44 | 3m 10s
NOVA’s Big Ideas of 2017
Take a look back with us at the biggest science stories of 2017.
Clip: S44 | 3m 8s
How to Prevent Train Crashes
Could a safety technology have prevented a train crash in Washington that killed three?
Clip: S44 | 1m 20s
NOVA Goes Ballistic
In honor of the New Year, we bring you a NOVA retrospective on ballistics.
Clip: S44 | 1m 11s
How Much Does a Thought Weigh?
Even in your mind, energy goes with it—bottle up that energy and it has mass.
Clip: S44 | 3m 57s
Climate Action Without the Feds?
Can states, cities, and companies fulfill US obligations to the Paris Accord on their own?
Clip: S44 | 2m 47s
When Turkeys Attack
Most wild turkeys are timid. But if one gets aggressive, what do you do?
Clip: S44 | 2m 36s
What's Inside the Great Pyramid?
Cosmic particles reveal a previously hidden void in the Great Pyramid of Khufu in Egypt.
Clip: S44 | 1m 45s
Will Robots Become Conscious?
What makes a brain or machine conscious? This theory is beginning to provide some answers.
Clip: S44 | 6m 13s
Why Do We Like Being Scared?
If a neuroscientist designed a haunted house, would you dare to enter?
Clip: S44 | 3m 21s
Why Home Runs Are on the Rise
What’s behind the recent surge in home runs in baseball?
Clip: S44 | 3m 15s
New Kind of Astrophysics is Born
Scientists saw and “heard” a dramatic cosmic explosion simultaneously for the first time.
Clip: S44 | 2m
Can Math Detect Gerrymandering?
The Supreme Court is hearing a gerrymandering case. Mathematicians are watching closely.
Clip: S44 | 3m 5s
Why Worry About ICBMs?
What are intercontinental ballistic missiles (ICBMs), and why are they hard to shoot down?
Clip: S44 | 2m 59s
Why Did Houston Flood?
Hurricane Harvey broke continental U.S. records. Here's how cities can be better prepared.
Clip: S44 | 3m 19s
How to Build the Universe
A how-to guide for anyone planning to build a universe.
Clip: S44 | 4m 23s
Even the mighty T. rex was covered in creepy, crawly parasites.
Clip: S44 | 2m 49s
Unboxing the Universe
What if everything in the universe came to your doorstep...in a box?!
Clip: S44 | 4m 20s
What Is Rabies?
Rabies is preventable, but it still plagues around 60,000 people a year.
Clip: S44 | 5m 4s
Best Way to Learn to Ride a Bike
Two centuries of bikes, and we’re still debating the best way to learn to ride one.
Clip: S44 | 2m 16s
Why Does This Frog Have So Many Legs?!
These frogs can have up to TEN back legs.
How to Build Your Dragon
Game of Thrones got us thinking — what would a real dragon look like?
Clip: S44 | 2m 17s
How to Find an Exoplanet
Want to find another world beyond our solar system? Here are the 5 ways you can do it.
Clip: S44 | 3m 43s