Ten years ago, Popular Mechanics put together a list of 8 Mysteries of Science—from a cure for cancer to the existence of other universes—that could, conceivably, be solved in the next 100 years. Now, they check back in to see how much progress was made, or not made, in a decade. You can read the year 2000 article and compare it to today. Nice way to give an otherwise throwaway listicle some legs and a sense of long-term journalistic accountability.