All videos for the tag : focal point (1 video)

  • Sandwich Bag Fire Starter
    1178139
    05:37
    94%

    Grant Thompson – the King of Random – teaches me how to start a fire with a Sandwich bag. And we tried to melt glass in my backyard: Check out his channel: The intensity of sunlight on Earth is about 1300 Watts per square meter. When you focus the sun’s rays using a magnifying glass…