- Conduct historical research at a site such as http://gdc.galegroup.com/gdc/artemis/?p=GDCS&u=bcptstothepast and look for historical evidence of the Hum. You may need to get creative in your search terms. Keep track of what you find out.
- Write a letter to the editor of your local paper, explaining what the Hum is, what our project does, and what we are doing. Ask for local hearers to come forward.
- Write to any of the following people and get them emotionally involved in the scientific mystery: a research audiologist (like Dr. Alec Salt), a radio physicist or engineer, a seismic geologist, an ear-nose-throat specialist, and so on. Explain our project. Refer them to me at firstname.lastname@example.org.
- Borrow a sensitive infrasound microphone and take nighttime recordings in your home. Send me the mp3 file.
I welcome other ideas that are accessible to non-specialists.