Northern lights in Finland. Aurora is a natural colored light display in the sky, particularly in the polar zone, which is produced by the collision of charged particles from Earth's magnetosphere, mostly electrons but also protons and heavier particles, with atoms and molecules of Earth's atmosphere (at altitudes above 80 km).
The particles originate from the Sun and reach the Earth in the stream of solar wind. - Pekka Parviainen
Lenticular clouds, like the one shown above, often attract attention due to their unusual shape. These stationary, lens-shaped clouds can form near mountains and other topography that force air to travel up and over an obstacle. This causes a series of atmospheric gravity waves, like ripples in the sky. If the temperature at the wave crest drops below the dew point, then moisture condenses into a cloud. As the air continues on into a warmer trough, the droplets can evaporate again, leaving a stationary lenticular cloud over the crest. This particular lenticular cloud was captured by Michael Studinger during Operation IceBridge in Antarctica. The line of ice in the foreground is a pressure ridge of sea ice formed when ice floes collided. (Photo credit: M. Studinger; via NASA Earth Observatory)
Ultrathin electronic tattoo that can track the relevant information about cardiovascular health, cognitive state, malignancy, internal temperature and many other important aspects of human physiology.
Literally wearing your medical data on your wrist, but the applications could extend beyond that. Though it has first been used on the skin, it can be applied to any part of the body, even printed directly on organs. How dystopic.