The Toba supervolcano was the biggest explosive eruption of the last 2.5 million years. And humans were around to see it, or at least feel its effects! But what were those effects?

In which Hank and John Green teach you a Crash Course on the modern revolution, and the upside of the progress that humanity has made in the last 500 years or so. And while there are two sides to every history, and many of these changes...

This video highlights the dramatic population growth of ancient Rome, which reached one million inhabitants due to massive rural-to-urban migration and the influx of cheap grain from Egypt. This demographic explosion transformed Rome...

Satyam Mishra is a maths teacher from Bhagalpur, Bihar, India, determined to change the way children look at the world through his pedagogy. He first got the teaching bug at age seven when he taught his 72-year-old grandmother to read...

Alright, we've learned about how unicellular organisms came to be, how they became multicellular, and then from those how evolution by natural selection produced all the species in the world today. But there are so many! Millions and...

This video explores the volatile nature of Indonesia, one of the most active volcanic regions in the world. The video highlights the risks faced by millions of Indonesians living in unpredictable areas and showcases the efforts of...

In which Hank and John Green teach you a Crash Course on the modern revolution, and the upside of the progress that humanity has made in the last 500 years or so. And while there are two sides to every history, and many of these changes...

Mount Vesuvius is most famous for its eruption in 79 A.D., which buried the city of Pompeii in volcanic ash, preserving it for centuries. It's a powerful volcano in Italy that is still active and being closely watched by scientists....