What is one thing in the natural world that you are curious about?

What is one thing in the natural world that you are curious about?

I am curious about what it takes to grow certain plants. Why do certain plants need more than others. I am curious about what it takes to make certain plants grow faster and better. I am also curious as to which bugs are possibly good or bad for certain plants, if there are any. Which fertilizers can certain plants use that other plants can't so that we don't grow them near each other.
With the garden I am very curious about the history of it. I am curious about what it was before and why it the upkeep of it stopped. I would like to know about what plants were there before. This could possibly become a documentary of some kind for multimedia with interviewing past gardeners or some NTC people.