Subcategories - Scientists
- William Dampier
- William Harvey
- William Murdock
- Willstätter Discovers the Composition of Chlorophyll
- Wolfgang Pauli
- The World’s First Breeder Reactor Produces Electricity While Generating New Fuel
- The World’s First Nuclear Reactor Is Activated
- X Rays from a Synchrotron Are First Used in Medical Diagnosis and Treatment
- X-Ray Crystallography Is Developed by the Braggs
- Zdansky Discovers Peking Man
- Zinsser Develops an Immunization Against Typhus
- Zwicky and Baade Propose Their Theory of Neutron Stars
- Zworykin Develops an Early Type of Television
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