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4YlJ TIL dragonfly wings actually kill bacteria. There is a variety of mechanisms for this to happen, but one of those is by literally ripping open the bacteria with sharp, nano-sized pillars that coat the wings.
6aAW TIL, you should measure the blood pressure in both of your arms. If there is a large difference, this may signify an increased risk of cardiovascular disease or even death.
J0Rv TIL, a beach in Russia is covered in “sea glass,” small, polished, colorful pieces of glass that formed from garbage dumped into the ocean. The beach is so beautiful, it has become a tourist destination.