The World is Watching Cities, Now More than Ever
COP21 brought cities into the spotlight. C40 is proud to help shine that light a little brighter. Because cities and mayors are acting now, and we're right beside them as they become necessary leaders in this vital cause.Watch the mayors of Bogotá, C

This scene shows several activated T cells attacking rapidly dividing cancer cells of a growing tumor. The activation and proliferation of cytotoxic T cells are critical for immune-mediated tumor destruction. Recent scientific advances have reignited interest in the area of cancer immunotherapy.

Stay Home Vogue - Vogue Corona Parody by Chris Mann.

Yo-Yo Ma, one of the world’s most renowned and beloved musicians, is trying to provide comfort in this time of crisis. Ma has been posting videos of himself performing short pieces and encouraging other musicians -- of all levels -- around the world to join him in offering “Songs of Comfort.” Ma joi

Join us as we delve into the diplomatic influence of the Aztec Empire on the global stage, forging alliances and shaping international affairs. Experience the fusion of Aztec wisdom, innovation, and environmental stewardship that make them a force to be reckoned with. Through stunning visuals, expe...

Come explore with us Madurodam the famous Miniature City in Holland The Hague - Den Haag Ever wanted to see what a miniature city looks like ? Madurodam which is actually a war memorial did a beautiful imitation of a mini city near The Hague in the Netherlands. We were super exited to explore this ...

The mechanisms of evolution explained in one video. The theory of evolution explains how the enormous variety of life could come into existence. How it is possible for primitive life forms to spawn the millions of different creatures, that exist today. Unfortunately, evolution is often misunderstood...

Global bee populations continue to be threatened by poor farming practices, pollution, and urban sprawl. Yet, in the middle of Israel’s arid Arava region, bee colonies are coming back to life thanks to a perfect mix of clean air and plentiful fields of pollinator friendly crops. Because of Jewish Na

On November 27th, 2022 the Mauna Loa volcano erupted for the first time in 38 years. As a result, a wide swath of Hawaii's Big Island, including 50,000 people are at risk of being inundated by lava flows. This video will discuss Mauna Loa's ongoing eruption which began at its summit just before midn...

How do you make a working human heart? Scientists can turn stem cells into beating heart cells, but getting them to organize into a 3D heart requires a scaffold. At the Massachusetts General Hospital in Boston, Harald Ott and his team are reusing the scaffold that nature provides. They're stripping...