The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts
The company is seen as crucial not just to local but national wellbeing – and never before have its workers been threatened in their own homeland like this
A wave of the hand, a flash of the lights – we’re always letting each other in and thanking each other for it. We don’t know how lucky we are, writes Adrian Chiles