Why are people talking about flying a flag upside-down?
Today, a bunch of people on my Mastodon feed are making declarations about somebody apparently flying a flag upside down, and this apparently has something to do with the New York Times being terrible....
https://kbin.social/m/nostupidquestion[email protected]/t/1038958
Your brain finds it easy to size up four objects but not five — here’s why
An experiment found that the brain uses one set of neural circuits to identify the numbers 1–4; these circuits are very specific to their own numbers. A separate set of circuits respond to the numbers 5–9; these are less precise, and are activated by adjacent numbers.... #neuroscience
Laser mapping reveals hidden structures in Amazon—with hints at thousands more
