How many balloons does it take to lift a person?
Jim writes – “I just wanted to let you know I uploaded a video that almost everyone will find interesting. Have you ever wondered how many helium balloons it would take to lift a human being off the ground? We did it, and the video is the story of what happened. I think almost every […]
Here’s an illustrated guide to build your own gravity measuring device, pretty cool videos. “…a “basement science” experiment which reveals the universality of gravitation by demonstrating the gravitational attraction between palpable objects on the human scale. The experiment deliberately uses only the crudest and most commonplace materials, permitting anybody who’s so inclined to perform it. Einstein’s 1915 theory of General Relativity explains gravitation as spacetime curvature created by matter and energy. So, by demonstrating how every object in the universe attracts everything else, we’re bending spacetime in the basement.” Thanks bf5man!
Another great how-it’s-made-site – “How Stuff Is Made is a visual encyclopedia that documents the manufacturing processes, labor conditions and environmental impacts involved in the production of contemporary products. It is a free, independent, academic resource published by engineering and design students, who research and produce summative photoessays describing these conditions of creation.” Thanks Star!