You may have seen recent news reports about London’s dangerous air quality.
In light of the current political climate in the U.S., I thought it might be timely to re-post a blog I wrote a few years ago about the… Read More
In the third century BC, Eratosthenes calculated the circumference of the earth as 24,700 miles. (It’s actually 24,900 miles). But no one listened to him. For 1500 years, everyone believed Claudius Ptolemy’s calculation, which was 17,800 miles. That’s the number Columbus used when he miscalculated where India was.