There are lots of cognitive biases in the world. Here are four -- from a list I discovered in some random web surfing. But re-written in my own style. Group Think. Also known as "communal reinforcement." Members of your echo chamber may constantly reassure one another that X is the case So of course you are certain, living in that echo chamber, that X is the case. I believe I once in this blog told a pertinent anecdote about the Japanese decision to expand the war in 1941. All of Hirohito's advisors were of the opinion that this was the right and necessary thing to do. From the Aleutians to Hawaii to Hong Kong to the Philippines -- go on the offensive throughout the Pacific. Hirohito himself had his doubts, but in the end even he, quasi-god or not, thought it necessary to stifle them and accept the hive mind's view. Availability Cascade. In science this is also called a research bubble. There has been some intriguing work done in special field X....