Note that different people have different research approaches. The two old ladies check that none of them can see herself and the problem is solved! ;-)
The other older lady makes an experiment with motion and rigorously determines that she is ... well ... unsichtbar. :-)
Knowing Too Little, Knowing Too Much - (Commenter nueww has asked me to comment on the flurry of blog posts around an interview with Lance Dixon that recently went up on the SLAC website. I’m no...
2 hours ago