Repliespwisdom808 (25)in science • 3 years agoRE: 10 Greatest Scientific Discoveries and Inventions of 21st CenturyNice articlesteem.history (78)in science • 3 years agoRE: 10 Greatest Scientific Discoveries and Inventions of 21st CenturyHello welcome to Steemit world! I'm @steem.history, who is steem witness. This is a recommended post for you. Newcomers Guide and The Complete Steemit Etiquette Guide (Revision 2.0) and…