https://discover.hubpages.com/education/Shays-Rebellion-and-Its-Impact-on-the-United-States-Constitution

https://owlcation.com/stem/Tycho-Brahes-New-Star-or-Nova-of-1572

https://owlcation.com/humanities/Timeline-of-the-Scientific-Revolution

https://discover.hubpages.com/education/Shays-Rebellion-and-Its-Impact-on-the-United-States-Constitution

https://owlcation.com/humanities/J-Robert-Oppenheimer-and-the-Making-of-the-Atomic-Bomb