Believe it or not, blood vessels contain blood. Don’t laugh. Some 3,000 years ago, people thought vessels carried air—and even urine.
For better or worse, everything we know today was built on ideas that came before us. There’s even a saying: “If we achieve greatness, it is because we stand on the shoulders of giants.” The “giants” of heart medicine are doctors and scientists who worked over the past 10,000 years. Some of their ideas were silly; many were just plain wrong. But their discoveries made modern medicine possible.
