What is unbearable, in fact, is the feeling, 13 years after 9/11, that America has been chasing its tail; that, in some whack-a-mole horror show, the quashing of a jihadi enclave here only spurs the sprouting of another there; that the ideology of Al Qaeda is still reverberating through a blocked Arab world whose Sunni-Shia balance (insofar as that went) was upended by the American invasion of Iraq.

Like stotting, pronking is a signal of medium excitation and is performed more often by fawns than by adults (1, 16).

Therefore, what the train of the future must do is offer a comfortable and enjoyable experience in well-designed carriages that (for example) have pleasant lighting, have seats that align with windows, and which are comfortable enough so that you can doze off without having to call your oesteopath as soon as you wake up.

The BAe 146 and Fokker 100's tailcone-mounted airbrakes allow them to slow down quickly for steep approaches without experiencing the lift degradation seen with spoiler-only aircraft.