[Whitfield:] Bottom of the hour now. Welcome back. I'm Fredricka Whitfield. Here are some of the big stories crossing the CNN news desk right now. Actor and comedian Tracy Morgan is back at home after being released from a rehab hospital center. He continues to recover from a car crash that left him critically injured last month. Officials say a Walmart truck rear-ended Morgan's limo on the New Jersey turnpike. The crash killed his friend and injured two others. Morgan is suing Walmart over the incident. The federal government has doled out billions of dollars to people who don't deserve it. The money included payments for tax refunds and unemployment benefits to social security and Medicare coverage that weren't legitimate according to a government watchdog agency. The mistake cost American taxpayers $106 billion last year. Wow, sudden rush of hail the size of golf balls! Pouring down on folks visiting a beach in Russia. A sunbather shot this video after the weather went from over 100 degrees to just 70 in minutes triggering this violent storm. Some folks screamed and ran for cover as the hail intensified there. Reportedly there were no injuries, thankfully. All right. TV chef Buddy Valastro, better known as the Cake Boss, and his wife had to be rescued from a boat that got lost in heavy fog there in the New York Harbor there. Valastro posted an Instagram photo, that one, right there of the incident. Authorities received an emergency call for help after Valastro's boat nearly collided into another boat in that dense fog. A rescue crew found them and towed the boat to safety. Valastro says he wants to thank his rescuers by, of course, baking them a cake. All right. John Walsh has helped law enforcement capture more than 1200 fugitives over the years. But technology is also playing an ever increasing role in the search for suspects. CNN's Alexandra Field has been digging into the latest technology at the NYPD crime lab and she has the science behind "THE HUNT."
[Alexandra Field, Cnn Correspondent:] The hunt is on for the most wanted among us. In our global era, the challenge seems broader than ever.
[Tom Fuentes, Cnn Law Enforcement Analyst:] It's a lot different than it was in the 1920s and '30s, when you had John Dillinger or Bonnie and Clyde commit a crime in one state and it was a big deal for them to just cross state lines. That's what's changed over the years, the you know, the ability to travel all over the world fairly easily and economically.
[Field:] But along with the emergence of the worldwide manhunt, the science behind chasing criminals has evolved, too.
[Lou Palumbo, Director Of Elite Intelligence And Protection Agency:] You can run, but you can no longer hide.
[Field:] From your image captured virtually everywhere down to your fingerprint, scientific and technological advancements have given investigators more sophisticated tools to work with. Our cameras take you inside the NYPD's closely guarded forensic crime lab, a front line for catching criminals. Better developing techniques in the fingerprinting field show detectives a clearer picture, so do evolving computer programs adding greater detail to tracing ballistic evidence. Advances in DNA analysis are widely considered the most meaningful step forward towards solving more crimes. But the forensics are just pieces of the increasingly elaborate puzzle. [On Camera] You really can't escape the cameras. They are virtually everywhere. Windows that can capture potential crimes, and with evolving facial recognition technology, they could be used to capture more suspects. But even without all those cameras, we know we are all leaving our very own well-marked digital trail. [Voice-over] From electronic data embedded in many of our digital images to our cell phone records, electronic banking transactions and all that social media activity, it's the indelible diary.
[Fuentes:] They had not planned in advance about being a fugitive and don't have literally hundreds of thousands of dollars of cash, false identities, possibly false passports that can enable them to travel around the world, having the means and the ability to cross borders, they're going to have a huge problem staying a fugitive for a real long time.
[Field:] The search net is wider, sometimes global. But our communications are making suspects easier in some ways to find. Law enforcement officials say advances in the way they can now communicate with each other makes it even tougher to hide.
[Palumbo:] We're inventing new ways to talk to each other, to communicate with each other, to be more efficient, to exchange information in general.
[Field:] Alexandra Field, CNN, New York.
[Whitfield:] All right. You don't want to miss "THE HUNT" with John Walsh. It premieres tonight 9:00 Eastern right here on CNN. A mayor who saw his fair share of scandal is opening up about his life and about the successes in politics as well and civil rights. Marion Barry wants people to know who he is and what his legacy should be. He joins me live from Washington next. But first, it's time to honor those making a difference in their community. Today a simple hashtag on Instagram is now changing lives in Atlanta. Here's CNN's Chris Cuomo.
[Chris Cuomo, Cnn Anchor, New Day:] Photographer Tim Moxley had an aha moment on Instagram in 2012.
[Tim Moxley, #weloveatl:] I was noticing that, you know, there were certain photos that told, you know, a bit about people, a story about people's lives in the city.
[Cuomo:] He brainstormed with fellow photographers and they created their own hashtag.
[Moxley:] Weloveatl is a hashtag that we started on Instagram for asking people to proclaim their love for the city, show a little bit about their lives in the city.
[Cuomo:] They showed some of the photos in an art gallery but when people continued to submit to the hashtag, they came up with a new plan.
[Unidentified Male:] We had the idea to buy a bread truck and turn it into an art gallery. Kind of a food truck for photography.
[Moxley:] We hang the photos in the truck and sell the photos and we donate all the money to the Atlanta Community Food Bank.
[Cuomo:] #weloveatl has helped families across north Georgia.
[Julie Bryant Fisher, Atlanta Community Food Bank:] We have been fortunate enough to be partner with WeLoveATL. And since that time that's brought us more than $7600. So for us at the Atlanta Community Food Bank, that equates to 30,000 meals.
[Cuomo:] Who would have thought a hashtag could do so much good?
[Aaron Coury, #weloveatl:] We're bringing kind of art and culture and charity together. And we hope that it starts to spread all over the country because we love the idea of celebrating your city. That what we've realized throughout this project.