jonathan metzl.e department of medicine, health, and society, at vanderbilt. his new book is "what we've become, living and dying in a country of arms." dr. metzl, thanks for joining us. the key message here in your book is that people who have long fought for better gun-control measures including yourself, things like red flag laws and background checks, that they have been arguing for this public health approach and you argue that approach is wrong. can you explain a little bit? dr. metzl: i would not say it is wrong. i would say i have done the last five years doing a deep dive into very traumatic and racially charged mass shooting that happen here in my hometown of nashville. what i found is that on the one hand, i'm an advocate for gun laws. i think we need stronger national gun laws. but as i uncovered the before and after of the case and really tracked the story of how not just a mentally ill white man, but a naked white man, how did a guy like that even get a gun, how did he get to the waffle

jamie metzl, great to see you. thank you so much. >> thank you. >>> all right. straight ahead, a brutal blast of arctic air is spreading through much of the u.s. over 250 daily cold records in the next couple of days. we'll spring you the latest forecast. get over here kids. time for today's lesson. wow. -whoa. what are those? these are humans. they rely on something called the internet to survive. huh, powers out. [ gasp ] are they gonna to die? worse, they are gonna get bored. [ gasp ] wait look! they figured out a way to keep the internet on. yeah! -nature finds a way. [ grunt ] stay connected when the power goes out, with storm ready wifi from xfinity. and see migration in theaters now. >>> some wicked weather is hitting the country. millions from california to maine are under winter alerts right now. dangerous coastal flooding and brutal cold are pounding new england today. i mean, just listen to that wind. people in parts of the midwest are dealing with vicious blizzard conditions right now, and it comes on the heels of a powerful storm that hit much of th