2 ideas from Joseph Priestley, each explained in a minute and credited to the original work. Free on Savvy.
In 1771, Joseph Priestley found that a candle burning in a sealed jar quickly went out — but if he added a sprig of mint and left it for days, the jar could support a flame again. …
— Joseph Priestley, Observations on Different Kinds of Air
In June 1752, Benjamin Franklin reportedly flew a kite with a metal key tied near the string during a Philadelphia thunderstorm, and found the key could produce a spark, suggesting…
— Joseph Priestley (recounting Benjamin Franklin's experiment), The History and Present State of Electricity