At least 2,500 people have been killed in Iran since protests broke out at the end of December, the Norway-based human rights organization Hengaw said on Tuesday. The group noted that its verification team is working daily to document deaths linked to the state crackdown on mass protests.

In his new book, the oncologist and health policy expert discusses longevity, and how to best differentiate valid and effective health and wellness advice from "the speculative, deceptive, and just plain stupid."

The psychological concept — which describes a pattern where an alleged abuser denies wrongdoing, attacks the accuser and reverses victim and offender roles — is gaining traction on social media.