The first step was figuring out a recipe. McDonnell started by looking at the Ebers Papyrus, a 3,500-year-old document from ancient Egypt that’s full of medicinal recipes. The document lists ...

It is a 20-meter long scroll, which covers the equivalent of approximately 100 pages. The Ebers Papyrus, along with the Edwin Smith Papyrus, are the oldest preserved medical documents in existence.