The most valuable lesson people should learn is to be skeptical, or at least look for validation in hopefully uncorrelated sources. Not that it's an easy thing

The most valuable lesson people should learn is to be skeptical, or at least look for validation in hopefully uncorrelated sources. Not that it's an easy thing today. When the web first took over in the 90's many people thought that truth and facts would now be easier to see; instead it's even easier to spread whatever you want and people will believe it because it's on the internet. Sadly schools are failing to teach kids to validate and challenge everything; instead we get laws passed that require that kids never be shown anything that might make them upset. In the end much of society winds up believing whatever they are told because they have no framework to question anything.