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)?
Plasticine William Harbutt was an art teacher who wanted a non-drying clay for use by his sculpture students. The exact formula is a trade secret.
After Sir William Herschel observed Uranus on 13 March 1781 while in the garden of his house in Bath, England, he reported it as a what?
