Participate in medical studies. If just the thought of this frightens you, know that the intensity of such studies varies greatly. Some studies ask participants (particularly those with medical conditions) to test treatments or medications that can have adverse side effects, but others ask participants to perform physical tasks with no lasting effects. If you are able-bodied and paranoid about keeping it that way, you can even participate as a control in a study at a nearby medical research facility or medical school.
Another option is to take photos locally for homeowners. Many people don't have good home listing photos of the home they're trying to sell. If you notice, many of these pictures, aside from the ones done by professional photographers, have bad lighting, show clutter, etc. If you're good at taking pictures and have a nice camera, you might be able to sell your photo taking services to real estate agents or to people trying to sell their own home.
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What does that mean for you? It means Nielsen will pay you $50 a year to keep their app on your favorite internet browsing device. The app itself collects statistics on your internet usage anonymously, so you never have to worry about any data being linked to you. And the best part is, the app takes up barely any space and doesn’t slow down your phone or tablet at all!