Why climate change action is difficult and how we can make a difference - David MacKay

12/04/14 • 60 min

2014 Charles Simonyi Lecture with David MacKay. David discusses how the laws of physics constrain our energy options, and describes what happened when his reflections on energy arithmetic propelled him into a senior civil service role.

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Forbidden Crystal Symmetry: Mathematics and architecture - Roger Penrose

World-renowned mathematician Sir Roger Penrose, Oxford University, describes how crystalline symmetries are necessarily 2-fold, 3-fold, 4-fold, or 6-fold.

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