431Who formulated the classical theory of electromagnetism, unifying electricity, magnetism, and light?
432Who discovered the electron?
433Who is credited with discovering the atomic nucleus?
434Who discovered the neutron?
435Who is credited with inventing the first motorized vacuum cleaner?
436Who is credited with inventing the modern sewing machine?
437Who is credited with inventing the safety pin?
438Who is credited with inventing the modern ballpoint pen?
439Who is credited with inventing an early version of the zip fastener?
440Who is regarded as a pioneer of practical photography with the daguerreotype process?
No Comments