Warning: Your reality is out of date

This artist rendering provided by the European South Observatory shows some of the 32 new planets astronomers found outside our solar system.

This article was sent in by Samuel Arbesman Research Fellow in Health Care Policy at Harvard Medical School.  It was originally printed in the Boston Globe.

When people think of knowledge, they generally think of two sorts of facts: facts that don't change, like the height of Mount Everest or the capital of the United States, and facts that fluctuate...