Science’s Greatest Unsolved Mysteries – Science’s 8 Greatest Unsolved Mysteries: Progress Report – Popular Mechanics

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Link: Science’s Greatest Unsolved Mysteries – Science’s 8 Greatest Unsolved Mysteries: Progress Report – Popular Mechanics

In the year 2000, PM asked how eight of the most profound questions in science might (optimistically) be answered before the dawn of the 22nd century. So where are we now, a decade later? Here’s the skinny on some of science’s greatest mysteries—from attaining immortality and the search for alien life to traveling through time.