OCW
How do Maglev trains work?
To coincide with the 1964 Tokyo Olympics, Japan launched a groundbreaking bullet train that inspired countries around the world to invest in high-speed rail. Today, high-speed trains regularly travel at over 300 km/h, on par with the take-off speed of a commercial airplane. But can it ever be faster..
TED
Two wars, no clear exit plan. Now what?
Six months into a catastrophic war in Iran — and with no end in sight for the war in Ukraine — the world is embroiled in conflicts with no apparent exit plan. In this interview, political scientist and Eurasia Group founder Ian Bremmer breaks down what these wars are costing people around the wo..
TED
Our last, best chance to cool the Earth
We're living through oil wars, wildfire smoke and extreme weather driven by a warming planet. But environmentalist Bill McKibben says one thing is finally going right: the price of clean energy has plunged, making it cheaper than ever to power the world without burning fossil fuels. He breaks d..
TED
How I built a machine that feeds millions
If you ate bread this week (or cooked with salt and oil), you probably benefited from something millions miss out on: food fortification. Social entrepreneur Felix Brooks-church is on a mission to solve
TED
Should you rinse your dishes before placing them in the dishwasher?
After years of hosting lavish dinner parties and watching her dishware get chipped during handwashing, American socialite Josephine Cochrane was convinced the world needed a better way to clean dishes. So, she built a prototype for a dishwashing contraption. And the design would become the model for..
TED
How to attack (and defend) a medieval castle
Medieval European castles weren’t just for passive defense and withstanding enemy onslaughts; they were symbols of power, private residences, and hubs of governance. Castles regularly served as bases for launching attacks and as a way to control local populations. So, how were these formidable for..
TED
