The original article (https://www.washingtonpost.com/nation/2019/07/26/it-snuck-up-us-city-killer-asteroid-just-missed-earth-scientists-almost-didnt-detect-it-t

The original article (https://www.washingtonpost.com/nation/2019/07/26/it-snuck-up-us-city-killer-asteroid-just-missed-earth-scientists-almost-didnt-detect-it-time https://www.washingtonpost.com/nation/2019/07/26/it-snuck-up...) includes links to some interesting background information, including the event leveling a huge forest area. And it correctly uses square km/miles instead of "square acres".