What, invented by William Harbutt of Bath, England in 1897, is composed of calcium salts (principally calcium carbonate), petroleum jelly, and long-chain aliphatic acids (principally stearic acid)?
In 1856, who invented the process whereby 5 tons of steel could be made in 30 minutes instead of in 50lb batches over 10 days and nights, at a tenth of the cost?
