LIVE: NBC News NOW - Feb. 19

Workers rescued after scaffolding collapse in California

Mark Zuckerberg testifies in social media addiction trial

Dump truck falls into massive sinkhole in New Jersey

Former Prince Andrew arrested following scrutiny over Epstein relationship

Investigators turn to genetic genealogy in Guthrie case

Shiffrin wins gold, USA men’s hockey advances to semifinals on Day 12 of the Olympics

Toddler goes viral after getting stuck in a claw machine

Thousands of acres in Oklahoma burn as wildfires spread

Delta flight returns after passenger attacks others

Axios reporter says Marco Rubio in talks with grandson of Raúl Castro

How genetic genealogy is being used in the Nancy Guthrie case

MIT nuclear science professor talks U.S. airlifting nuclear reactors

Toddler turns claw machine into personal ball pit

NBC Nightly News Full Episode - Feb. 18