The best part about creating a digital product is that you only have to create it once, and you can then sell it thousands of times. When you think about the time and effort that goes into writing an ebook or creating an online course, don’t forget that you can sell that product an infinite number of times without having to put in any additional work (aside from the occasional marketing efforts). This means that while you are in bed, fast asleep, people around the globe could be buying a digital product you created years ago. It’s passive income, and you don’t have to wake up in the morning and ship anything to the buyer – they already have it.

If you’ve ever brewed beer, made old-fashioned sauerkraut, or experimented with one of the many other fermented comestibles that have gained popularity in the last decade or two, you know that microbes are experts in liberating energy from mundane substances.

Hoping to progress the mobility of four-legged robots, a team of MIT engineers has developed a new type of control system that has the potential to give them concurrent terrain data generation and traversing abilities.