How are memories stored and retrieved in the human brain? originally appeared on Quora - the place to gain and share knowledge, empowering people to learn from others and better understand the world. Memory is not my field of research and this response of course is very far from complete. But here are some thoughts which I hope you may find interesting. 1) There are different forms of memories and they are also encoded in the brain in very different manners. 2) For instance, working memory (like when you hold a few numbers or an address in your mind) is very different from long-term memory. One way in which working memory is stored is by keeping neural circuits that encode the remembered items
-
5亿年前的生物看起像太空外星人
ScienceFox News
500-million-year-old creature looks like a space alienIt looks like a space alien, or maybe a very deformed clam. But really, it's a re-creation of a 500-million-year-old life-form. New images show a sculpture of Agnostus pisiformis, a now-extinct arthropod that used to live in what is today Scandinavia. These creatures, just four-tenths of an inch (1 centimeter) long when they were alive, are nevertheless