Researchers have designed a new type of microgear that spins when micromotors become lodged into the corners of the gear's teeth. The micromotors use the surrounding hydrogen peroxide solution as fuel to propel themselves forward, which in turn causes the microgears to spin. In the future, the tiny gears could be used as the building blocks for making autonomous micromachines.

The world population, which stood at 5 billion in 1950, is predicted to increase to 10.5 billion by 2050. It's a stunning number since it means the planet's population has doubled within the lifetimes of many people alive today. At the same time, arable land is shrinking and crop productivity is stagnating.

Because Earth is the only place that we know has life, uncovering its origins is a considerable challenge. That said, scientists have not ruled out the other locations in the Solar System. There are several icy moons that could have oceans with microbial life inside, such as Europa (at Jupiter) or Enceladus (at Saturn). And much closer to us is an entire planet with a history of water — Mars.
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