27 Feb
2013
27 Feb
'13
11:42 p.m.
A mathematician, a physicist and an engineer take a train from London to Yorkshire. As they cross the county boundary, they see a field of black sheep. The engineer says "All the sheep in Yorkshire are black." The physicist says "You cannot say that. All you know is that all the sheep in this field are black." The mathematician says "No! All you can say is that at least one side of every sheep in that field is black." Guy