Population ecology is the study of groups within a species that interact mostly with each other, and it examines how they live together in one geographic area to understand why these populations are different in one time and place than...

Is the world overpopulated or underpopulated? While we worry about there being too many people for the planet to support, we can also worry about how fewer people in a given place may affect the economy, what may happen when there are...

Over the last four episodes, we’ve examined some of the stories that make up the idea of a “revolution” in knowledge-making in Europe. But we can’t understand this idea fully, without unpacking another one—the so called Age of...

Consider a bat that is infected with several deadly viruses, including ones that cause rabies, SARS, and Ebola. While this diagnosis would be lethal for other mammals, the winged wonder is totally unfazed, and may even spend the next 30...

On January 17, 1920, less than one hour after spirits had become illegal throughout the United States, armed men robbed a Chicago freight train and made off with thousands of dollars worth of whiskey. It was a first taste of the...

SciShow takes you inside the site of the world's worst nuclear disaster to show you how, nearly 30 years later, life has adapted and persisted.

SciShow takes you inside the site of the world's worst nuclear disaster to show you how, nearly 30 years later, life has adapted and persisted.

Hank guides us through the process of natural selection, the key mechanism of evolution.

In this video Paul Andersen outlines the AP Environmental Science course. He explains how environmental science studies the interaction between earth and human systems. A planetary boundary model is used to explain the importance of...

Virus hunter Nathan Wolfe is outwitting the next pandemic by staying two steps ahead: discovering deadly new viruses where they first emerge -- passing from animals to humans among poor subsistence hunters in Africa -- before they claim...

Population statistics are like crystal balls -- when examined closely, they can help predict a country's future (and give important clues about the past). Kim Preshoff explains how using a visual tool called a population pyramid helps...

Off the coast of South Africa, a small group of orcas with an apparent taste for shark liver have been taking out great white sharks since at least 2017. And, honestly, that’s not even the strangest thing killer whales have been up to...

Germany is one of the most densely populated countries in Europe. In fact, in the Rhine-Ruhr Valley, there are no obvious boundaries between cities. It’s just a mass of urban sprawl. Explore commonalities among German cities, which tend...

Conservation specialists from San Diego Zoo Global look for diseases that may impact wild populations of one colorful species.

San Diego Zoo Global is working to understand threats to the endangered thick-billed parrot.

Learn how these birds were affected by California fires and what conservation scientists are doing to help bring their populations back up in the wild.

What are they looking for? Diseases that may impact the wild populations of this colorful species.

Learn how these birds were affected by California fires and what conservation scientists are doing to help bring their populations back up in the wild.

San Diego Zoo Global is working to understand threats to the endangered thick-billed parrot.

Learn how these birds were affected by California fires and what conservation scientists are doing to help bring their populations back up in the wild.

Conservation specialists from San Diego Zoo Global look for diseases that may impact wild populations of one colorful species.

Conservation specialists from San Diego Zoo Global look for diseases that may impact wild populations of one colorful species.

Learn how these birds were affected by California fires and what conservation scientists are doing to help bring their populations back up in the wild.

People in many countries greatly overestimate the number of Muslims living among them, often due to fear-based news and stereotypes. For example, Americans think 17% of the population is Muslim, when it's actually less than 1%. This...