I have a recurring teacher dream: I am shepherding a gigantic class — 100 kids or so, all first graders — on a very long walking field trip. The destination is unclear and unimportant. The kids are ...

LONDON—The British have famously strict etiquette for queuing. Dare cut in line here and you’ll quickly be met with scorn, or at least a tut. But there is one place where forming a single line has ...