Many teachers say they strive to teach their students to be critical thinkers. They even pride themselves on it; after all, who wants children to just take in knowledge passively? But there is a problem with the widespread treatment of critical thinking as a skill to be taught.
Be careful what you touch, and what you eat. Some vegetation can snuff out your life as surely as a venomous snake. There are hundreds, if not thousands, of poisonous plants in the world, and some of them are deadly.