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.
John Mackey, CEO of Whole Foods Market, an Amazon subsidiary, is a member of The Motley Fool's board of directors. Selena Maranjian owns shares of AbbVie, Amazon, Costco Wholesale, and National Grid. The Motley Fool owns shares of and recommends Amazon. The Motley Fool recommends Anheuser-Busch InBev NV, Costco Wholesale, Lowe's, National Grid, and The TJX Companies. The Motley Fool has a disclosure policy.

If you spend a lot at Amazon.com, for example, you can get a card that rewards you with 5% cash back on Amazon purchases -- which can really add up. Stores such as Target, Costco, Gap, Lowe's, TJX, and Wal-Mart also offer cards. Plenty of retailer cards offer 3% to 5% in cash back or discounted prices and many offer other perks, too, such as free shipping. If you travel a lot, travel-related credit cards can help you rack up lots of points and rewards that can be used instead of cash, keeping more cash in your pocket.
Work as an online interpreter or translator. If you’re fluent in a foreign language, it makes sense to look for work as an online interpreter or translator. Depending on your individual skillset, you could find work translating blog posts or eBooks, transcribing recorded lessons or speeches for clients, or translating through Skype or another online video service. And, thanks to the increased use of foreign languages in the United States, getting started could really pay off. According to the Bureau of Labor Statistics, employment for interpreters and translators is expected to increase 17% nationally through 2026.
Sell hair, plasma, or other body parts/fluids. Long, healthy, untreated hair can be sold for a variety of purposes (including high-end wig- and extension-making) and earn you anywhere from several hundred to several thousand dollars depending on color, health, and length. Plasma can be “donated” (for compensation) provided that you are old, healthy, and heavy enough to qualify. Sperm can be donated, but you usually have to know (and be able to document) a fair amount of information about your parents as well as your medical history to be eligible. But be wary; for example, donating eggs is often touted as a fast, high-profit medical procedure, but the process is actually requires that the participant undergo hormonal and medical treatment, receive regular checkups and ultrasounds, and abstain from sex and intoxicants, all of which take weeks or even months before the eggs are even eligible for removal. The removal process itself is invasive and lasts about 30 minutes.[3] Consider your options very carefully before taking on anything like this.
Become a babysitter. Babysitting is a common way to make some extra money on the side.[26] There are now professional services you can sign up for that will connect you with people who need a babysitter. For these services, it will help to pass a CPR class or other certification, or to have a talent or expertise for entertaining children. However, you might be able to make money more quickly just by babysitting for people you know, or by having friends refer you to others who need a babysitter.
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!
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