Parkland siblings David and Lauren Hogg say #NeverAgain

It’s been almost six months since the massacre at Marjory Stoneman Douglas High School in Parkland, Florida, where 17 people were killed. But out of that tragedy emerged a group of students dedicated to preventing future school shootings, including David and Lauren Hogg. Hari Sreenivasan recently spoke with them about their movement and new book, “#NeverAgain.”