Sen. Mitt Romney warned in his farewell address of those who "tear at our unity," urging America to uphold the nation's values as he capped more than two decades in public service.

United Healthcare CEO shot and killed outside New York apartment; North Carolina residents battle freezing conditions.

Michael Breus, a clinical psychologist and author of "Sleep Drink Breathe: Simple Daily Habits for Profound Long-Term Health," shares tips on how to better hydrate and more.

There's a manhunt underway for the suspect in the killing of UnitedHealthcare CEO Brian Thompson, who was shot outside a New York City hotel, officials say. Felipe Rodriguez, a former detective with the New York City Police Department, joins CBS News with his take on the crime, and CBS News' Anna Schecter breaks down what's known so far.

Jared Isaacman, 41, the founder and CEO of Shift4 Payments, has emerged as a leading figure in commercial spaceflight.

Sen. Mitt Romney warned in his farewell address of those who "tear at our unity," urging America to uphold the nation's values as he capped more than two decades in public service.

UnitedHealthcare CEO Brian Thompson was shot and killed outside a Hilton hotel in Midtown Manhattan, police say.

The Supreme Court weighed whether Tennessee's ban on gender-affirming care for minors experiencing gender dysphoria violates the Constitution.

Jared Isaacman, 41, the founder and CEO of Shift4 Payments, has emerged as a leading figure in commercial spaceflight.

Here's what we know about UnitedHealthcare CEO Brian Thompson, who was shot to death in Manhattan on Wednesday.