What these two processes share is baked into the math of each. In fact, in that respect, they're nearly identical. They both involve some stuff (atoms or money) that is either growing or shrinking. And best yet, they both have a magic number. 
We all remember Rebecca Black. Oh, do we remember. She sang "Friday," that awful but irresistibly catchy tune (viewed 105 million+ times on YouTube!!), which will forever be a part of our culture. Had she sung about Pi Day, however, perhaps the song would have had a more positive reception. Today, March 14th (3/14), is Pi Day, because the mathematical number pi is rounded off to 3.14. Pi is an irrational number (meaning it cannot be adequately expressed as a fraction of two whole numbers) that is derived by dividing the circumference of a circle by its diameter.  Pi: Not Just Another Number
If fisherman might be inclined to keep his favorite fishing spot a secret, but sometimes it helps to tell others. They may return the favor and tell you about other great places. It's a dilemma that also faces hunters. When should you share information, and when should you go at it alone? A new study might have some answers.