David Eagleman is a renowned American neuroscientist and a well-known "brain science guy", who gained widespread popularity following his Emmy-nominated PBS documentary, The Brain with David Eagleman (2015). It's a series I believe everyone should absolutely watch regardless of their interest in science in general. This show raises and answers a lot of questions you may have on how the brain operates (as far as the contemporary science can tell) and how this affects everyone on a daily basis.
I see Mr. Eagleman as a person from the world of "popular science", considering the way he delivers his ideas and discoveries on public and how he presents his views overall.
In the following video he gives a short and effective presentation on how human biology is tightly intertwined with one's personality. It's no secret that people are different. We have extremely contrasting views on various subjects and beliefs. Our personalities, especially, can make or break our ability to make friends, take part in a conversation, develop skills and so on.
But not many are aware that it's not just society, environment and education that take part in forming a pliable, developing mind. It's the body one resides in and carries around that can, and absolutely does affect one's the very decision and adds even more credibility to a well-known proverb:
"A healthy body makes a healthy spirit"
This brief presentation is a short and sweet bit of information of the topic that might help you take your body seriously as well as think twice before attributing actions of others to pure malice or conscious ill will. The person you know may be either a guest or a hostage to his or her own body and hopefully this talk will give you a basic idea why we are so different at the most fundamental level. Since a tower of cards we call "consciousness" is built upon this very foundation, when the underpinning groundwork is starting to give, the whole building is surely to be affected as well.