In this issue:
“The Limits of Intelligence": The laws of physics may prevent the human brain from evolving into an ever more powerful thinking machine.
"The Best Medicine": Doctors may have come up with a prescription for our skyrocketing health care costs.
"The Last Great Global Warming": Surprising new evidence suggests that the pace of the earth’s most abrupt prehistoric warm-up paled in comparison to what we face today.
"Hacking the Lights Out": The electrical power grid could be the next big target for a powerful computer virus.
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