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Science Blog was started in August 2002. It lives, breathes and eats press releases from research organizations around the globe. Most of what you read here are press releases from the outfits named in the stories themselves. Got a news story you think belongs here?
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Time is not a straight line. It is more like ripples in the ocean of space-time. No one can change or even visit the past. Once you theoretically are in the past your very presence regardless of what you do or not you start traveling in an alternate "ripple" of time. Think alternate realities instead of changing time you are now visiting an alternate timeline and have therefore changed nothing.
I know, I'm from the future.