On his World Cup tour of Russia, explorer Sergey Gordeev visits Sochi's Center for Reintroduction of the Leopard in the Caucasus to learn about efforts to grow the dwindling Persian leopard population in Russia.

Africa’s stealthy predator. Alone but silent and deadly. It is also undoubtedly, Africa’s most beautiful predator. Patterns moving in and out of shadows this episode looks at the camouflaging success of the spotted solitary stalker in one of the most prolific wildlife areas of the world.

Bill Nye on el nino.

El Niño is a series of complex weather patterns that occurs every two to seven years. It causes drastic changes in weather that can lead to billions of dollars in damages, high death tolls, and disease. Find out what causes El Niño, how it can affect you, and why it is so hard to predict it.

What is El Niño? Why is it such a big deal? And why do we call it El Niño?