China’s Amazing Water Canal | China’s Future MEGAPROJECTS: Part 2

South-to-North Water Transfer Project: The huge populations filling China’s northern megacities have a shortage of the single most necessary resource for life: water. To solve that problem, the Chinese will soon be moving 44.8 billion cubic meters of fresh water each year from the wetter South to the dryer North.

Why It’s HARD To Land on Mars

This video is about why it’s harder to successfully land spacecraft and landers and rovers on Mars than on Earth, or Venus, or the Moon, or Titan, or asteroids. It all comes down to atmospheric density! When there’s no atmosphere, you can do a powered descent in a flimsy tinfoil spacecraft like the Lunar Module, and when there’s plenty of atmosphere you can do an unpowered descent via heat shield and parachutes like the space shuttle, Apollo command module, Soyuz, Huygens, etc. But on Mars with its thin air, you have to do both powered & unpowered descent, getting the worst of both worlds.