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Thanks, I had no idea lead-bismuth reactors existed. It seems the large number of unstable lead isotopes and their long decay chain would assure a long cooldown requirement before …

It may just be easier to design a zero G litter box. A screen bottom with a coarse granular material and sufficient airflow through the bed could work. No idea how a cat would dig …

I have a couple of EM tables,one from 1956,the other from 1966. Schematics used to be freely available untill somebody scooped up the copyrights and issued takedown notices so they…

It has been one before. https://en.wikipedia.org/wiki/Rozi%C3%A8re_balloon

I've often wondered if a double envelope would be worthwhile. Use a thin outer envelope containing He, and an inner lifting envelope with H. The outer envelope would contain any H …

As noted, the lower explosive limit for hydrogen in air is 4%. Significantly lower with pure oxygen. https://www.safeopedia.com/definition/2205/explosive-flammab... The problem is …

A British film documenting theory and operation of the V2 rocket.

Strength to weight ratio and high temperature properties.

More interesting than copper as used in the example would be nickel or rhodium.

An easy path to metal matrix composites.

Every single component in every single aircraft certificated in the USA is tracked all the way to the mine. A quick web search reveals around 11.3 million people work in the aviati…

This looks like a very useful reference on the subject. Thanks!

This is a wonderful resource, looking forward to exploring.