What makes some people more convincing than others, even if they aren't necessarily smarter, like con artists or certain politicians?

Why does love sometimes feel like the most beautiful pain in the world?
How can I make sure my modesty concerns are respected during medical procedures, and what should I say to the staff beforehand?
Why is the share of the male more than that of the female in inheritance?
How does jealousy differ from healthy competition, and when does it become harmful in relationships or at work?