Here's another example to add to the 'Pluto' example (which explains why up-to-date electronic texts are better): the atomic weights in the periodic table have changed. "The standard atomic weights of 10 elements morphed from a single number to a low and a high value, known as an interval. The update is meant to better reflect how these elements vary in natural substances. For instance, the atomic weight of oxygen is slightly greater in air than in seawater." It took an argument and a vote for the change to be made, but it was, which means if you memorized the periodic table, you'll have to go back and make some changes. Note that this is basic science, with no current industrial application. Just saying.
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