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  • Manhunt—Boston Bombers Which technologies worked—and which didn't—in the race to track down the men behind the marathon attack? Airing May 29 at 9 pm

  • Oklahoma's Deadliest Tornadoes Hear harrowing stories from survivors of Moore’s massive tornado and meet scientists who stalk these ferocious storms. Airing May 29 at 10 pm

  • The Egyptian Bow See how the ancient Egyptians built their deadly composite bows. Watch the video.

  • The Energy Lab Explore ways to make the most of renewable energy sources and use real data to design your own virtual power systems. Get started.

  • Guess the Embryo See if you can tell what four similar-looking embryos will become, and watch each develop. Give it a try.

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