https://youtube.com/watch?v=_OjUtqv7LDgMexico City was built on an ancient lake and gets more rain than London, but it's still running out of water. For millions of its poorest residents, getting enough is a daily challenge. To solve this critical problem, Social...

https://youtube.com/watch?v=Rsend-1FbaMThe long, disheartening decline of passenger rail in the U.S. may be turning around, thanks in part to the ambitious efforts of a new high-speed train service in Florida called Brightline (soon to renamed Virgin Trains, connecting Miami to...

https://youtube.com/watch?v=1P6KjZbfZ5cImpossible Foods’ founder and CEO Pat Brown wants to replace all meat with plant-based alternatives. His company has helped usher in a new era of meatless burgers, products intended to taste like the real thing. As Impossible expands, Brown...

https://youtube.com/watch?v=NvnJrH1WW98Plastic is both a super product and an ecological nightmare. It's cheap, durable and won't rot, which means it's great for shopping bags and fast food, but also means it sticks around for hundreds of years.

https://youtube.com/watch?v=jFWHxZpF9rcFor most any nation, let alone a superpower, energy independence is considered the geopolitical holy grail. So when fracking lured in American investors, everyone had high hopes the country would finally break free of OPEC. But oil is a...

https://youtube.com/watch?v=-pU3lfz2xN8The starry night sky seems remarkably distant from the topic of air conditioning, but it’s revolutionizing the field in quite an unexpected way. In this episode of "The Spark," watch how scientists from across the globe are harnessing natural...

https://youtube.com/watch?v=iFTToTsJuY0Intelligent, indestructible and with no humans on board, these sailboats are plotting their own course through the waters of San Francisco Bay. If Richard Jenkins gets his way, soon there’ll be hundreds of them – trawling the oceans for...

https://youtube.com/watch?v=DKbRL6OpifgThe Dutch capital Amsterdam is widely known for being bike-friendly. But it wasn’t always a model cycling city. Public outrage at rising traffic casualties in the Seventies caused city planners to rethink their approach to urban design. Video by...