Wadah Khanfar: A historic moment in the Arab world
As a democratic revolution led by tech-empowered young people sweeps the Arab world, Wadah Khanfar, the head of Al Jazeera, shares a profoundly optimistic view of what’s happening in Egypt, Tunisia, Libya and beyond — at this powerful moment when people realized they could step out of their houses and ask for change.
Salman Khan: Let’s use video to reinvent education
Salman Khan talks about how and why he created the remarkable Khan Academy, a carefully structured series of educational videos offering complete curricula in math and, now, other subjects. He shows the power of interactive exercises, and calls for teachers to consider flipping the traditional classroom script — give students video lectures to watch at home, and do “homework” in the classroom with the teacher available to help.
Rogier van der Heide: Why light needs darkness
Lighting architect Rogier van der Heide offers a beautiful new way to look at the world — by paying attention to light (and to darkness). Examples from classic buildings illustrate a deeply thought-out vision of the play of light around us.
Mehr davon gibt es bei TED – Ideas worth spreading.