Substance use and substance use disorder differ by the frequency of use and the effect on a person’s life. Substance use disorder is a mental health condition. Substance use refers to using both legal ...

In 1961, MIT meteorologist Edward Lorenz was inputting numbers into a weather prediction program. His model was based on a dozen variables, the value of one being .506127. When he ran the model again, ...

Small changes can have incredibly large and unintended consequences, whether for good or for ill. And no matter how smart you (think you) are, there’s absolutely no way that you can predict all of the ...