Bill explains how the rise of home air conditioning had to battle the open air movements in public school: They regarded it as only for factories where it was first introduced. Only when movie theatres added air conditioning in the 1930 and 1940s did it become popular for the home.
How to blow up your air bed if you haven't got a pump. Simple solution which doesn't leave you out of breath. Ideal for camping.
We showed people what they looked like in ultraviolet, & wondered aloud if they wanted to put on some sunscreen already.
