I laughed out loud to see Friday's XKCD cartoon. Click the image to be taken to its Web page, where you can read the mouseover text as well.
The point, of course, for those who aren't into astronomy, is that there are precisely three stars in the Alpha Centauri system. The cartoon conflates that fact with three-star consumer reviews.
I do enjoy it when practitioners of science, or medicine, or any other discipline, poke fun at themselves. It lightens the air for everyone. I still giggle at the memory of my sister's midwifery training at Groote Schuur hospital in Cape Town, many decades ago. At one point there was a spate of "blue babies", infants who were not breathing, or not breathing properly, at birth. To jolt her trainee midwives into being more aware of the problem, the matron in charge of that class put up a notice in the break room. In large capital letters, it warned:
THE FIRST FIVE MINUTES OF LIFE ARE THE MOST DANGEROUS!
It didn't take long before someone added, in equally bold print:
THE LAST FIVE MINUTES ARE A BIT DODGY, TOO!