Common sense is not a gift, it’s a punishment. Because you have to deal with everyone who doesn’t have it.
The brain isn’t a flawless piece of machinery. Although it is powerful and comes in an easy to carry container, it has it’s weaknesses. A field in psychology which studies these errors, known as biases. Although you can’t upgrade your mental hardware, noticing these biases can clue you into possible mistakes.
How Bias Hurts You
If you were in a canoe, you’d probably want to know about any holes in the boat before you start paddling. Biases can be holes in your reasoning abilities and they can impair your decision making.