Video · Where do math symbols come from? – John David Walters TwitterShare on Facebook2K 800 025 views Ted Education - October 30, 2017 Science Ted More Videos Beyond the Gates – Mrs. Richardson…x2? TV · 21 hours ago Beyond the Gates – Mrs. Richardson…x2? TV · 21 hours ago What lack of sleep does to the teenage brain – Wendy Troxel Science · 1 day ago What lack of sleep does to the teenage brain – Wendy Troxel Science · 1 day ago How lead affects your body – Gerald Markowitz and David Rosner Science · 6 days ago The 3 best predictors of how well you’ll age – Juulia Jylhävä Science · 1 week ago The 3 best predictors of how well you’ll age – Juulia Jylhävä Science · 1 week ago How does leg lengthening surgery work? – Jason Shih Hoellwarth Science · 2 weeks ago
