In short I measure this the similar way as you measure which restaurant for you is good and which is bad.
Probably there exist postmans whos command of knowledge about black holes is very strong, but I believe an average postman knows quite little on topics like that.
In short I measure this the similar way as you measure which restaurant for you is good and which is bad. Probably there exist postmans whos command of knowledge about black holes is very strong, but I believe an average postman knows quite little on topics like that.