Aggregation Know your data 30: everything's ok until it happens to you Kaiser muses about Elon Musk and his flight log.
Cause-effect Open questions of the pandemic, part 3 Kaiser posts another pair of questions, showing that we don't have answers for basic questions about the pandemic.
Assumptions Great data journalism should have destroyed Djokovic's story but it didn't Kaiser describes some fun data sleuthing work as Germans looked into a tennis superstar's Covid-19 test results.