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A Google Tech Talk by Steve Weis that introduces modern cryptography and its use in practice and at Google. It covers proofs of security and security definitions and a special topic. HN commenters treat it as a talk on verifiable electronic voting.

Karl Fogel's 2006 Google Tech Talk traces copyright from a 16th-century English censorship law to a distribution monopoly. It then surveys alternative economic bases for creation and distribution.

Eben Moglen of the Software Freedom Conservancy speaks at the 2009 Law of the Commons Conference about free and open software as a model for a new intellectual commons. The talk covers the legal and social case for sharing knowledge.

A clip in which Eben Moglen tells how he grew up when software was freer and how his path crossed Richard Stallman's. He describes how they came to work together to make software free again.

A Google Tech Talk by sleep researcher Dr. William Dement on healthy sleep and performance. He argues sleep debt must be repaid and describes the three characteristics of healthy sleep.

Jon Kabat-Zinn leads an hour-long Google tech talk on mindfulness, introducing the basic ideas and including a guided meditation. It is aimed at newcomers.