An electron is a subatomic particle with a negative electric charge that is equal, but opposite to, the positive charge of a proton.
Guinea (coin) The guinea was a coin of approximately one quarter ounce of gold that was minted in Great Britain between 1663 and 1814. The name came from the Guinea region in West Africa, where much of the gold used to make the coins originated. It was the first English machine-struck gold coin, originally worth one pound sterling, equal to twenty shillings, but rises in the price of gold relative to silver caused the value of the guinea to increase, at times to as high as thirty shillings. From 1717 to 1816,
A guinea is 21 shillings and a pound is 20, but for the sake of simplicity, we'll go with 2000 pounds. The historic inflation calculator (http://www.thisismoney.co.uk/money/bills/article-1633409/Historic-inflation-calculator-value-money-changed-1900.html) equates 2k pounds in 1920 to being worth about 90k pounds now. Today's exchange rate is 1.57 dollars to one pound. So, 2k pounds in the 1920s is roughly 141k in US dollars today.