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around that time, scientists learned something extraordinary. whales were communicating with each other. sometimes by song over long distances. in part, because of that discovery, scientists and conservationists rallied to enact laws to protect the whales and it worked. the humpback whale population has made a remarkable comeback. now they face a host of new threats. global warming is killing off their food source and human activity is causing thousands of whale deaths a year from the stress of underwater construction noise to fishing entang amments and ship collisions. in the next h...

50 years ago humpback whales were considered an endangered species after decades of commercial whaling decimated the population. around that same time scientists learned something extraordinary. whales were communicating with each other, sometimes by song over long distances. in part because of that discovery scientists and conservationists rallied to enact laws to protect the whales, and it worked. the humpback whale population has made a remarkable comeback. but now they face a host of new threats. global warming is killing off their food source, and human activity is causing thous...

>> the united states, our allies and our partners will do what we have to do to counter the start sent to protect these ships. >> holiday shipping season is in full swing. how ai technology is thwarting porch pirates. >> it is computers versus criminals and we have to use every tech capability that we have. >> this is like something. >> norah: a stunning images coming out of iceland after a volcano erupts. the fast-moving lava. >> my dream is to be the first female marine in the olympic spirit >> norah: and our series, "profiles in service." we will introduce you to a marine who hope...

>> i'm buckling up more on flights before. >> you didn't buckle up? >> always. >> tighter. >> on a flight. >> yeah. well, you know, i mean, this is a big problem. good morning, everyone. welcome to "cnn this morning." we have to talk about another alarming close call at one of america's biggest airports between a private jet and a jetblue flight coming in for a landing. that makes five close calls in just two months. that's way too many. i don't think it's normal. we're going to check. the faa have a serious problem on their hands? we'll break it down. also to chicago and the mayor...

spill. most people don't know this but i am thrilled to be here. my whole life i loved late night tv. remember when it was great? steve allen, johnny carson. jay leno. that's what we grew up watching. for example when i was an intern across the street at 30 rock, i interviewed david letterman before he had his beard and when he used it to be funny. i give him a t-shirt so for me to be here in the number one late-night show is truly an honor and i am honored to be with the panel that you have yet to meet. a lot of people don't know that. david letterman just opened up to his biographe...