Price's Law states that the square root of the total number of items or participants contributes to at least half of the results.

I have found this to also be true with total revenue and profit of sold items.

This might be a hobby I want to try. Inspired by davep's post. It could be fun to try and identify fossils. Maybe catalogue and record findings. I have to see if its possible in the beaches here; maybe around the Agusan–Davao Basin.