Coconut octopuses are among the most intelligent invertebrates around: They use tools, carry their shelters around for when they need them, and, fittingly, adopt an underwater walking motion that's very similar to humans.

Dr. Oliver Sacks describes uncanny out-of-body experiences of his patients. From his new book, HALLUCINATIONS.

Neurologist and author Oliver Sacks brings our attention to Charles Bonnett syndrome -- when visually impaired people experience lucid hallucinations. He describes the experiences of his patients in heartwarming detail and walks us through the biology of this under-reported phenomenon.

Matthew Liao, Director of the Bioethics Program at New York University believes that soon, neuroscientists will be able to use drugs to selectively erase traumatic memories from the brain. NYU bioethicist Matthew Liao thinks we should have the right to modify memories to improve our well-being.

Brazil says thousands of babies have been born with abnormally small heads --- since October. The health system is struggling to cope with the outbreak linked to the Zika virus - which is spread by mosquitoes. The rare brain defect affects the babies' physical and mental development. The disease has...

THE SOUND of Silence - Simon & Garfunkel / Cover Cello by HAUSER: Hello darkness, my old friend
I've come to talk with you again Because a vision softly creeping Left its seeds while I was sleeping
And the vision that was planted in my brain
Still remains Within the sound of silence...

A group of over 50 active duty service members and veterans are using humor to fight Post Traumatic Stress Disorder. Retired Marine Capt. Danny Maher, has been calling Marine Sgt. Ryan Loya his best friend since the two bonded in Afghanistan. Maher broke at least 20 bones, and Loya suffered traumati

"Everything we think is real is, in some way, an illusion." Former NASA illustrator Kurt Wenner makes incredible, brain-busting chalk illusions. His works start with diligent planning, beginning with pencil and paper. Kurt even prototypes by using an iPhone's camera to mimic human sight. He then map...

In an exclusive interview with TODAY’s Matt Lauer, actor Charlie Sheen says, “I’m here to admit that I am in fact HIV positive.” He says that reports that he has threatened the health of others “couldn’t be farther than the truth.” He says he first found out about his status “about four years ago” a

"Have you ever had a gut feeling or butterflies in your stomach? Has hunger ever changed your mood? Our bellies and brains are physically and biochemically connected in a number of ways. As a nutritionist, microbiologist and neuroscientist, Ruairi Robertson is passionate about the link between our b...