scienceTimeline of Penicillin20 eventsMajor scientific, medical, and industrial milestones in the discovery and development of penicillin.
scienceTimeline of Polio Eradication20 eventsMajor scientific and public-health milestones in the global effort to control and eradicate polio.
scienceTimeline of Smallpox Eradication20 eventsMajor milestones in the history of smallpox control, vaccination, and global eradication.
scienceTimeline of the History of Plastic20 eventsMajor scientific, industrial, and cultural milestones in the development of plastics.