Science4All (english)'s video: Einstein s happiest thought Relativity 14

In 1907, Einstein had the happiest thought of his life, the one that would initiate an 8-year-old seemingly impossible quest for a theory of gravity. While the theory is awfully complex, the thought that led Einstein therefore is wonderfully simple... and has to do with astronauts' weightlessness. The Massive Puzzle of Gravity | Science4All.org http://www.science4all.org/le-nguyen-hoang/gravity/ Don't heavier objects fall faster? Galileo's Thought Experiment | Science4All 12 https://www.youtube.com/watch?v=Vz9q-TuBrgo How did Newton figure out gravity? On the shoulders of giants | Science4All 13 https://www.youtube.com/watch?v=tHq3_0dxLQ0 What's Einstein's gravity? General relativity explained! Science4All 15 https://www.youtube.com/watch?v=zZDoSpiIxs0 Is gravity acceleration or curvature? Follow-up clarifications | Science4All 16 https://www.youtube.com/watch?v=WbhUsPuioN8 Why Are Astronauts Weightless? Veritasium https://www.youtube.com/watch?v=iQOHRKKNNLQ The Physics of Weightless Flight ft Emily Calandrelli | Physics Girl https://www.youtube.com/watch?v=7v-viGyoZAU