Link dump: 2009.07.08

From the four corners of the web:

• Technology Review: Blogs: Guest Blog: Ray Kurzweil on How to Combat Aging
  The noted futurist says that exponential advances will allow us to intervene in the aging process.
• In Search of Lost Memories | Utne
  If people could delete specific memories, which ones would they choose?
• Physical reality of string theory demonstrated
  Leiden theoretical physicists have now for the first time used string theory to describe a physical phenomenon.