In this short, optimistic talk from TED2009, Pete Alcorn shares a vision of the world of two centuries from now -- when declining populations and growing opportunity prove Malthus was wrong.

Paul Andersen defines microevolution as any change in the frequency of the allele pool. He then explains the five mechanisms of evolution; small sample size, non-random mating, mutations, gene flow and natural selection.

During the 17th century, the Dutch East India Company cornered the booming spice market and pioneered trade routes between Asia and Europe. It is widely considered the most profitable corporation ever created. But such success came with...

Baked or fried, boiled or roasted, as chips or fries; at some point in your life you've probably eaten a potato. But potatoes have played a much more significant role in our history than just that of the dietary staple we have come to...

Multidisciplinary artist and TED Fellow Paul Rucker is unstitching the legacy of systemic racism in the United States. A collector of artifacts connected to the history of slavery -- from branding irons and shackles to postcards...

Paul Andersen explains how populations interact in an ecosystem. The symbiosis of several populations is based on effects that may be neutral, positive, or negative. Interactions like mutualism, commensalism and parasitism are...

In this video Paul Andersen explains how immune individuals in a population give the entire group a herd immunity. Concepts of immunity, vaccines, basic reproduction number, and herd immunity threshold are discussed.

You vote, but then what? Discover how your individual vote contributes to the popular vote and your state's electoral vote in different ways--and see how votes are counted on both state and national levels.

It sounds like science fiction, but journalist Stephen Petranek considers it fact: within 20 years, humans will live on Mars. In this provocative talk, Petranek makes the case that humans will become a spacefaring species and describes...

In the 20th century we added an unprecedented number of years to our lifespans, but is the quality of life as good? Surprisingly, yes! Psychologist Laura Carstensen shows research that demonstrates that as people get older they become...

The pothos plant grows really well in a lot of places, so you’d think they’d be easy to coax blossoms out of, but even the greenest thumbs haven’t seen this plant bloom naturally in over 60 years! Why are the pothos petals so shy?

Why there will likely soon be more tigers in backyards in Texas than in the wilds of Asia.

Hank gets into why sex is the preferred method of reproduction for most species - and it's not for the reasons you're thinking.

Lemmings are small, thickset vole-like animals that live in the Arctic tundra. They live in a harsh environment, are super-cute, kinda mean, and totally misunderstood.

Paul Andersen shows you how we can use a spreadsheet to model population changes. He begins with a brief discussion of populations and life cycles. He then shows you how you can model a single generation using a spreadsheet.

Paul Andersen explains how organisms respond to the external environment. He begins with a discussion of behavioral responses like hibernation and migration. He ends with a discussion of physiological responses like shivering and...

Paul Andersen explains how populations experience exponential. He begins by address the major players; N (population size) and r (growth rate). He models population growth in rabbits through four generations. He then shows you how to...

In which John Green teaches you about the United States Constitution. During and after the American Revolutionary War, the government of the new country operated under the Articles of Confederation. While these Articles got the young...

For the first time, researchers have observed two cases of asexual reproduction in condors. And it also turns out that whales are much hungrier than we thought.

Hank talks about population genetics, which helps to explain the evolution of populations over time by combing the principles of Mendel and Darwin, and by means of the Hardy-Weinberg equation.

Between 2008 and 2016, the United States deported more than three million people. What happens to those left behind? Journalist Duarte Geraldino picks up the story of deportation where the state leaves off. Learn more about the wider...

There are many names for them, but here at SciShow we lovingly refer to them as 'Gingers'. In this episode, Hank explains what gene is responsible for the creation of redheads.

In which John asks whether globalization is a net positive for humanity. While the new global economy has created a lot of wealth, and lifted a lot of people out of poverty, it also has some effects that aren't so hot. Wealth disparity,...

In the past 3,000 years, many populations have evolved genetic adaptations to their local environments. People in Siberia and the high arctic are uniquely adapted to survive extreme cold. The Bajau people can dive 70 meters and stay...