Or simply read their work. For example, some of Einstein's original papers. https://en.wikipedia.org/wiki/Annus_Mirabilis_papers https://en.wikipedia.org/wiki/

Or simply read their work. For example, some of Einstein's original papers. https://en.wikipedia.org/wiki/Annus_Mirabilis_papers https://en.wikipedia.org/wiki/Annus_Mirabilis_papers