4) A smaller unit than Satoshi is in use now called msat!
11) The first transaction for Bitcoins was made for PIZZA! (the first time when it was used as a Currency)
The #4 was new to me I thought that Satoshi or Sats was the smallest unit of Bitcoin,
And about #11 could you give us the link or more info about it because it it was about the pizza guy I think you should edit to the first known transaction as a currency,
Because if it was about the guy I think there are others who used it as a currency to buy service or even stuff from others online.