"The illiterate of the 21st century will not be those who cannot read and write, but those who cannot learn, unlearn and relearn." Alvin Toffler
And I'm also reminded of Shift Happens: half of what college students learn in their 1st year will be outdated by their 3rd year...
...when I read this article in the USA Today about Pluto.
Here's the money quote: "Students who have just learned about the concept of dwarf planets must now be taught the new concept of plutoid," said Janis Milman, who teaches earth science at Thomas Stone High School in Maryland. "This will lead to confusion in the classroom and resistance to learning the new terms, because the students will question, why learn something that might change again in a year or so?"