Medical Notes: Week of May 9, 2021

A look at the top medical headlines for the week of May 9, 2021 including: The injection of nanoparticles deep into the brain can produce relief for those with chronic pain and depression.  Then, diagnoses for the four most common cancers take a big jump when people hit age 65. And finally, a new study shows that narcissistic people pump themselves up only because deep down inside, they don’t believe they’re any good.