US West Coast: on frontline from nuclear cloud?

California is closely watching the crisis at a Japanese nuclear plant, but officials downplayed the threat that a radioactive cloud blown across the Pacific could pose for the US West Coast.

What will threaten us in 2040?

Could terrorists of the future use a swarm of tiny robots -- less an a quarter-inch high -- to attack their targets? Will new bio materials be able to target individuals carrying specific genetic markers? Could cyber-attackers ...

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