Engineers at Ford designed a cheap air filtration system schools can use when kids are back in classrooms.  The base is cardboard, and you put a normal 20-inch box fan on top.  They’re planning to donate 20,000 of them next month.………….We hit a weird milestone this week, but a good one:  We’ve now had more vaccinations in the U.S. than COVID-19 cases.  On Monday, official stats showed 26.5 million Americans had gotten at least one dose of the vaccine.  And 26.3 million had tested positive since the pandemic first started……….And finally………