Formula 1 won't face a bigger technical challenge this season than it is currently tackling at this weekend's Mexican Grand Prix.
The Circuit Hermanos Rodriguez is 2200 metres above sea level. That's 1400m higher than the next highest venue on the F1 calendar, Brazil's Interlagos circuit.
That basically means everyone is short of breath in Mexico. The air is so lacking in oxygen content relative to other tracks that all the usual set-up parameters are thrown off, and the cars behave quite differently to elsewhere.