- I continued to practice the method I had set for myself. In addition to following its rules for all my thoughts generally, I set aside certain hours specifically to apply the method to solving mathematical problems or even to questions from other sciences. By removing these questions from the less certain principles of those sciences, I made them almost as precise as mathematical problems. You can see evidence of this in the many examples included in this volume.
- Messier 93 (Wikipedia)
Messier 93 or M93, also known as NGC 2447 or the Critter Cluster, is an open cluster in the modestly southern constellation Puppis, the imagined poop deck of the legendary Argo.