Cyril P. Callister created what food spread from leftover brewers' yeast extract in 1922?
Cyril P. Callister Cyril Percy Callister (16 February 1893 – 5 October 1949) was an Australian chemist and food technologist who developed the Vegemite yeast spread.
Bar Keepers Friend Bar Keepers Friend is a brand of mass-produced cleaning agents. The original canned powder product has been manufactured and sold since 1882. It was invented by a chemist in Indianapolis, Indiana, where it continues to be manufactured by SerVaas Laboratories. The canned product's primary active ingredient is oxalic acid, and Bar Keepers Friend has several various cleaning uses.