Learn to guesstimate big numbers. It will help reduce your apparent anxiety when confronted with American imperial units of measurement.
I totally agree. I'm American and having done some international travel and having worked for an international company, I have some friends around the world who I stay in touch with from time to time and I've just learned how to do rough conversions in my head from imperial units to metric so I can tell them things like "I live about 40 km from my office" instead of saying "I live 25 miles from my office" and having them wonder whether that is a lot or not. Temperature conversions are not too difficult either. By the way, the source article appears to come from the USA, so the summary was just made on what the submitter read and I don't blame him/her for not bothering to convert. Had it been in metric units, the submitter probably would have just reported that.