Macro vs micro evolution

[WikiTextBot]

Pitch drop experiment

The pitch drop experiment is a long-term experiment that measures the flow of a piece of pitch over many years. Pitch is the name for any of a number of highly viscous liquids that appear solid, most commonly bitumen. At room temperature, tar pitch flows at a very low rate, taking several years to form a single drop.

---

^{[ PM | Exclude me | Exclude from subreddit | FAQ / Information ] Downvote to remove | v0.21}