Ted Robbins

The morning after a gunman targeted and killed five law enforcement officers, Dallas Mayor Mike Rawlings called it "ironic" that his city was the target of the worst police loss-of-life since the terrorist attacks on Sept. 11, 2001.

This summer, NPR is getting crafty in the kitchen. As part of Weekend Edition's Do Try This At Home series, top chefs are sharing their cleverest hacks and tips — taking expensive, exhausting or intimidating recipes and tweaking them to work in any home kitchen.

First up: making magically moist sous vide chicken without the fancy equipment.

Derek Lucas Reyes, 20, went from being undocumented in the U.S. to undocumented in his native Mexico.

He sits at a table after breakfast in a shelter filled with people recently deported from the U.S. to Nogales, Sonora. At his feet is a paper shopping bag the Department of Homeland Security gave him for his belongings. Inside the bag: his deportation paperwork, a toothbrush, toothpaste and some other necessities he got from Mexican aid workers.

Millions of gallons of water used to flow every day from the Rocky Mountains to the Gulf of California. Now, the Colorado River ends at Morelos Dam on the U.S.-Mexico border. Below it, one of North America's largest wetlands is dry.

Karl Flessa, a geoscientist at the University of Arizona, began researching the damage two decades ago. Then he started asking how much water it would take to bring back some of the habitats.

Border Patrol checkpoints aren't always near the border. Some aren't even on roads that go to the border. Take Arivaca Road; it's an East-West route 25 miles north of the Mexican border in Southern Arizona.

A Border Patrol checkpoint has been operating there around the clock for seven years. Some residents of the town of Arivaca say agents at the checkpoint go well beyond their legal authority; searching vehicles and questioning citizens without cause. So they've begun their own monitoring — to inspect the process.

Let's say you're skiing in the backcountry, looking for some powder — but instead, you trigger an avalanche.

If you have an avalanche air bag pack strapped to your back, you just yank the cord. That deploys the air bag, which keeps you close to the surface and easier to dig out, says Andy Wenberg with Backcountry Access, one of several companies making the devices. When deployed, his company's version of the air bag comes out like wings.

"The whole idea when you deploy that thing in an avalanche is you're avoiding burial death," he says.

Freestyle aerial skier Mac Bohonnon recently finished second at the Val St. Come World Cup in Quebec, and that helped him qualify for the Olympics in Sochi. But when he's not doing triple-twisting double backflips, he's taking Advanced Placement classes at Team Academy in Park City, Utah.

As the U.S. government has militarized the California and Arizona segment of the Southwest border over the last two decades, illegal crossers have moved to another area. South Texas has become the new border hot spot.

The Rio Grande Valley is also the closest route to Central America. Two-thirds of those caught crossing are from that troubled region.

The Border Patrol and local authorities are straining to keep up.

Fleeing Poverty And Murder

A years-in-the-making, top-secret engineering and design project for a superaerodynamic suit to be worn by U.S. speedskaters at next month's Winter Olympics was finally unveiled Thursday.

Defense contractor Lockheed Martin and sporting goods company Under Armour released photos of the suit they're calling "Mach 39." It has been kept so tightly under wraps that the sport's governing body wouldn't even allow it to be worn at the Olympic trials in Salt Lake City.