Jets have proved a remarkable conveyance modality since the second world war for one & all..

However VERY FEW have pondered what OTHER risks come with Jet airplane flight than the obvious risk of gravity when the engines fail.

Other than Airline-food, the other unsung risk to ones well-being in Jet air flight is THE RISK TO HIGH ENERGY RADIATION ill-effects.

Every Jet should exhibit a sign above the boarding-entrance saying 'DANGER- RADIATION-RISK'… Enter at your own risk.
Why should this be a condition of entry to jet flight? Simple.
The higher one goes in elevation above sea level the 'thinner' the atmosphere, the greater one is exposed to Cosmic rays from deep space.

Yes, yes, yes I know Boeing and others do their best to shield the occupants during design of aircraft to this risk however, other than lining the fuselage in lead then YOU are being bombarded from these particles from deep space.
So how many Jets would get airborne lined in Lead? ZERO!!!!!!!!!!!!

Therefore given what we already know about the ill-effects of radiation being cumulative, then IF YOU ABSOLUTELY MUST FLY, do it infrequently.

More soon.