Blogs, logs and the scientific revolution

The word blog means web log, and this is my second blog post ever. A ship’s logbook is a record for navigation and operation of the ship. Explorers, scientists and doctors have always used logbooks, diaries and journals, knowing that small observations may add...

The power of counterexamples

Once upon a time a single cat, incidentally named Pebbles, came to refute a whole theory of cats. The general theory was “All cats are black”. Not a very good theory, since Pebbles is a grey cat. The power of a single counterexample is enormous. In...