Many interesting articles. It felt really modern to me, not what I would have expected from reading something from almost 100 years ago. I found the overly optimistic article on page 28 about longevity research especially amusing.
AFAIK Vehicles use flexible rubber pipes because the rigid copper pipes of fixed split ACs would not withstand the vibrations of a car. The downside of these more flexible pipes is that they leak more.
I'm not sure I follow. What symbols should be used for variables? Once you run out of all characters in the Latin alphabet, you either use another one or you have to resort to subscripts, hyperscript etc.
What makes you say, that the bombing of Coventry was "probably an accident"? There was repeated, and clearly well planned out bombing of the city between 1940-1942 [1].
It was not a remark intended to excuse the Germans. There is some evidence, which I am admittedly struggling to find a citation for at the moment, that the early 1940 raids were generally intended to hit military targets and the Germans just weren't good enough at bombing to be that discriminate.
Later on of course both sides were hitting civilian targets deliberately, and using incendiaries and high explosives. But it's possible the British were the first to do it deliberately, in retaliation for the Germans doing it accidentally (which they naturally did not believe).
