These extinct frogs used to barf up their babies—and now scientists are trying to bring them back from the dead. Discover more in this episode of Gross Science.

In this special report, NOVA investigates what happened in Flint, Michigan when local officials changed the city’s water source to save money, but overlooked a critical treatment process. As the water pipes corroded, lead leached into the system, exposing the community—including thousands of children—to dangerous levels of poison. NOVA uncovers the science behind this manmade disaster.

Gross Science explores hand hygiene, with some help from the show Clean My Space.

For almost 13 years, the spacecraft Cassini has been in the Saturn system, documenting the planet and its moons. Cassini’s days are numbered—on 15 September, it will be sent hurtling towards Saturn. But just because it’s running out of fuel doesn’t mean it’s running out of fire. Cassini has a lot more science to do in its final chapter.

During WWII, Nazis forced Samuel Bak and his family out of their home in Vilna, Lithuania.

In a forest in Lithuania, a team of scientists searches for traces of a vanished people.

At ground zero for the final solution, scientists uncover a story of hope and bravery.

Hana Amir describes her father escaping the Holocaust through a tunnel he helped to dig.

Jewish scholars in Lithuania risked death in WWII to save their literature from the Nazis.

Zalman Matzkin narrowly escaped the Holocaust in Lithuania, managing to build a new life.

Esia Friedman tells the story of how her family made it through the Holocaust alive.

In Lithuania during WWII, Abe Gol’s father led Jewish prisoners in a tunnel escape.

NOVA has stood for science since 1974, bringing remarkable discoveries to TV and beyond.

Fear may be able to spread from person to person—just like a virus.

Weighing 54,000 gross tons and stretching over two football fields, the Seven Seas Explorer is no ordinary boat. Join pioneering shipbuilders as they endeavor to build the ultimate cruise ship. It will be decked with the finest gold, marble, and crystal and designed to offer guests the roomiest accommodations of any commercial cruise ship. But engineering opulence is no easy feat.

Here's everything you didn't want to know about snot.

Every country wants to consume as much energy as the US. Where will that energy come from?

A new way of making supercapacitors may help them store more energy than normal batteries.

A scientist must explain the Big Bang and dark energy so two comedians can understand it.