Scientific American - April 2009 No. 4
English | PDF | 78 Pages | 9.25 MB | 3% Recovery Record
In the April 2009 Issue:
Dark Energy, Does it really exist? Or does Earth occupy a very unusual place in the universe?
Also in this issue:
• Color Vision: Our Eyes Reflect Primate Evolution
• Green Lasers: The Next Innovation in Chip-Based Beams
• Soldiers' Stress: What Doctors Get Wrong about PTSD
• Virus Watch: Preventing the Next Pandemic
• Solving the Mystery of the Vanishing Bees
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