There is one - and only one - group of mammals that doesn’t have alpha-gal: the catarrhine primates, which are the monkeys of Africa and Asia, the apes, and us.

They have survived every catastrophe and every mass extinction event that nature has thrown at them. And by being the little, filter-feeding, water-cleaning creatures that they are, sponges may have saved the world.

As revolutionary as teeth were, they would go on to disappear in some groups of vertebrates. But why?

Humanity has changed a lot since the days of our ancestral species, and we have continued evolution to look forward to as well.

In this video Paul Andersen defines natural selection as differential reproductive success. He then explains how natural selection shapes organisms on our planet through variation and selection. A K-12 teaching progression is also...

A common misconception is that evolution is a long chain of progress, where organisms gain cool, new features over time. However, if a trait doesn't help with survival or reproduction, eventually it can disappear. Here are a few...

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.

Hank gets real with us in a discussion of evolution - it's a thing, not a debate. Gene distribution changes over time, across successive generations, to give rise to diversity at every level of biological organization.

Paul Andersen explains the importance of genetic variation within a population. He begins with a discussion of the devil facial tumor that is a form of cancer transferred between Tasmanian devils. He then explains how a decrease in...

Brit looks back on our second month on Nature League, when we explored the theme of biodiversity.

In this episode of "From A to B", Adrian asks Brit about the relationships between intelligence, evolution, biodiversity, and tool use.