Legend says that brewing tea dates back to around 2737 BC, when tea leaves fell into water being boiled for … Continue reading How was the tea bag invented?
Polytetafluoroethyene will not dissolve in acetone or ether or concentrated sulfuric acid. When Roy Plunkett first found it coating some … Continue reading How did Teflon come about?
If you are a cyclist like me, you will know that battery-powered bike lights are a pain. If you’re regularly … Continue reading How can a light be made without batteries?