On Netflix, I came across the documentary 'Fantastic Fungi.' The most prevalent form of life on earth is truly amazing, and essential for the natural cycles of life whenever any type of organism dies and needs to be broken down so new life can replace it.
Research into anything related to mushrooms and other fungi is possible in simple experiments and setups, without a need for huge expenses. Studies are, of course, conducive to field work in literally any environment and ecosystem you live near, from urban to suburban to forest to field to anything else you can think of, so field work is a nice option. Fungi help break down anything that is naturally built from hydrocarbons, and the 'root' networks literally everywhere in the world, which is called mycelium for mushrooms, form the largest living networks on the planet. The mycelium, which consist of trillions of webs and interconnections in just a cubic meter of soil in a forest, is a neural network similar in structure to our brain's network of neurons. Trees use mycelium as part of their underground communications networks (yes, trees and plants 'talk' to each other through their root systems!). There are over one-million species of fungi, so do experiments that explore the growth and uses/applications of fungi/mushrooms! This can also lead to finding the most efficient and productive ways of growing edible mushrooms as food sources in the home, for very little cost, that low income households and food deserts can use. There are all sorts of ideas for this amazing kingdom, so be creative and find an original piece of this to study!