• I think the discovery of penicillin has impacted our lives the most because antibiotics have saved millions of people from dying from simple infections since then.
• It was a major breakthrough when man invented the wheel thousands of years ago as it paved the way for the development of vehicles, but also other things like the water wheel and the windmill, which gave humans a power source.
It was a major breakthrough when the printing press was invented because it allowed many books to be printed quickly, making knowledge much more widely available and improving education.