While my neck got fixed

Arthur C Clarke

"A teacher who can be replaced by a machine, should be."

Which you can think about in at least two different ways if you follow the work of Sugata Mitra.

Serious Signage...

Saw this sign today (on tv, not in person!)...
 

That sign means business. It is not mucking around.
It is a serious sign!!

I am wondering what signs you might have already passed before you got to where that sign is!