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