June 03, 2016 at 12:19AM

Tody I Learned: 1) "Neural lace", also known as "Syringe-injectable electronics". It's a mesh-like metal device so thin and diaphanous that it can be injected with, you guessed it, a syringe. Right now they don't do a ton, but last year a Harvard team of scientists built a neural lace device for reading neural activity, injected it into mouse brains, and read out cell activity. The mice were completely unharmed as far as the researchers could tell, and continued to be unharmed by the presence of the lace for five weeks after injection (after which they were sacrificed for autopsy and histology). More interestingly, the mouse's brain cells incorporated the mesh, growing around it and forming tight junctions with it. 2) ...another terrifying way the Earth can kill you called a limnic eruption, or lake overturn. Limnic eruptions are very rare (fortunately), only occurring in large bodies of water that develop massive pockets of CO2 from geologic activity. A sufficiently large geologic disturbance can cause all the CO2 to erupt from the lake, displacing air in a huge radius and killing most everything in its path. Example: In 1986, Lake Nyos, in Camaroon, erupted. Scientists believe it probably created a 100-meter-tall fountain of water and foam, creating a tidal wave 25 meters high. Nobody's sure, though, because the massive cloud of CO2 killed pretty much everyone within 25 km of the lake, and knocked out everyone else. !!!!!! 3) On a *highly* related note, CO2 is about 50% denser than air, so large amounts of CO2 released at once will roll like fog.