Art therapist Melissa Walker is using masks to allow service members with traumatic brain injuries express their deepest emotions and experiences, helping them and their loved ones.

Author of the book Animal Madness, TED Fellow Laurel Braitman shares 5 ways in which animals and humans suffer from similar mental illnesses. Anthropomorphism run amok? You decide.

What happens when the technology for manipulation on the neural level becomes possible? Could there be a future therapy for people with depression or PTSD — or heartbreak? Do people really want to have their memories manipulated? Elizabeth Loftus, Steve Ramirez and Xu Liu grapple with some big questions.

P.W. Singer directs the Center for 21st Century Security and Intelligence. He shares thoughts on drones and the future of war.

Drones have a lot of people (and entire countries) hot under the collar. Here’s what you need to know about this type of warfare.