It may look like a kid’s toy, but this simple contraption made from paper and string provides scientists in less developed areas with access to a critical piece of lab equipment at virtually no cost, and with no need for electricity.
We’ve long since moved on to LCD and OLED displays, which render images a frame at a time, but for many years, televisions and monitors used cathode ray tubes. This slow-mo video shows how the picture was “painted” line by line using a scanning beam of electrons.
A mystifying physics demonstration from science teacher Bruce Yeany, in which he shows off a simple device known as a “string shooter.” It uses a motor drive to fling a loop of string into the air and keep it there thanks to their light weight and the inertia that keeps it moving forward.
This video comes with no explanation, but it appears that it’s a group of students in a science class passing around a flaming ball of propane. It’s also possible that it’s just the Fire Manipulation 101 class at Professor Xavier’s School for Gifted Youngsters.
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