Two more reminders that a great deal of what we "know" about the world is speculative, unsettled, or just plain inaccurate:
* The settlement now called Istanbul is apparently 6,000 years older than previously believed.
* The Milky Way Galaxy is apparently 50 percent more massive than previously believed.
Start your day with Reason. Get a daily brief of the most important stories and trends every weekday morning when you subscribe to Reason Roundup.