There is an ongoing shortage of several prescription drugs used to treat ADHD, including Adderall. The CDC urged people to avoid using medication acquired from anyone other than a licensed clinician and pharmacy.

We share what you had to say about our conversation with ADHD Doesn't Exist author Dr. Richard Saul and the ruling to expedite same-sex marraige licenses when we read some of our viewer feedback.

We meet the Chicago doctor who claims in a provocative new book that ADHD does not exist. Read a book excerpt.

Sniffing out relatives? It may not be the human way, but it works for one finely dressed bird. We explore penguin behavior and more in tonight's Scientific Chicago.