Comment Re:Canning is not rocket science (Score 1) 131
Check out "Early History of USDA Home Canning Recommendations" for some fun stories about that time Grandma didn't make it... There is literally a 100 years of science in modern canning recommendations.
USDA approved recipes have been validated many times over accounting for variations in food density, growing conditions, elevation, equipment, with many 9s worth of safety built in.
Sure you can follow the recipe and it works out great, but that doesn't mean its trivial.