You probably think you are rational. However, MIT philosopher Brian Hedden thinks that our rational thinking should be based on the present time and knowledge, rather than past or future considerations. He introduced the concept of "time-slice rationality," which suggests that we should consider ourselves as being composed of multiple time slices, each with its own rational thinking. Hedden's idea originated from his research at MIT, where he pursued his PhD in philosophy. His doctoral thesis, "Reasons without Persons," explored the nature of rational thinking and decision-making. Hedden argues that our rational thinking should be based on current evidence and information, rather than past experiences or future expectations. This concept is not limited to the field of philosophy; it can also be applied to everyday life. For example, when making decisions, we should consider current information and evidence, rather than relying on past experiences or future expectations. This way of thinking can help us make more rational decisions, avoiding unnecessary biases and errors. Blogger's Review: Hedden's concept of "time-slice rationality" provides us with a new perspective on rational thinking and decision-making. By considering ourselves as being composed of multiple time slices, we can make more rational decisions, avoiding unnecessary biases and errors.