Air travel horror stories typically involve lost luggage, missed connections and overzealous security staff. But families affected by autism face other challenges in navigating airports and planes.

A Philadelphia program is bringing families, airport employees and airlines together to help autistic kids fly more comfortably.

Airports are loud, hectic places: blaring announcements, glaring lights and long lines can spell trouble for people with autism. They often can't tolerate noise, bright lights and close quarters.

Linda Wertheimer talks to Rich Jaroslovsky, tech columnist for Bloomberg News, about his top gadget picks for 2011.

Steve Inskeep and Linda Wertheimer have business news.

In 2011, Novak Djokovic had just about the best year a male tennis player has ever had, including wins at three of the four Grand Slam tournaments.

"This is the athlete of the year," says Jon Wertheim of Sports Illustrated. "This is a brutal, brutal sport. This guy is playing on six continents, every surface....This is one of the all time great years in open tennis history."

This year, Djokovic also kept to a gluten-free diet. Must have been particularly difficult since his family's business is a pizza parlor.

Debra Meyerson was hiking near Lake Tahoe 15 months ago when a stroke destroyed part of the left side of her brain, leaving her literally speechless. It happens to more than 150,000 Americans a year.

But now Meyerson is learning to talk again through an approach that trains the undamaged right side of her brain to "speak." Specifically, it's a region that controls singing.

For more than 100 years, it's been known that people who can't speak after injury to the speech centers on the left side of the brain can sing.

At rodeos, barrel racing has long been a popular event. Riders, often young women, race their horses in a cloverleaf pattern around barrels in an arena. Using quarter horses, the sport has grown in popularity in recent years and has its own circuit of races and competitive riders.

But in Gretna, Fla., a plan to turn barrel racing into a betting proposition has run into opposition. Quarter horse breeders and trainers are suing to stop it, saying the new event could destroy their industry.

The digital cloud became a household word in 2011.You can now store and share things via the Internet in ways you never could before. But what does the cloud look like, and where can we find it?

The section of the cloud we visited has a lot of concrete and security.

Behind a ballistics-grade door, data center owner David Sabey ushers us into a spotless Seattle-area facility the size of nine football fields. It's crammed full of racks upon racks of powerful servers, sophisticated computers that serve up information. There are lots of blinking lights and wires everywhere.

Hurricanes topple plenty of trees, but when you think about it, the more amazing thing is that many trees can stand up to these 100-mile-per-hour winds.

Now a French scientist has come up with an explanation for the resilience of trees. And astonishingly, the answer was first described by Leonardo da Vinci 500 years ago.

Leonardo noticed that when trees branch, smaller branches have a precise, mathematical relationship to the branch from which they sprang. Many people have verified Leonardo's rule, as it's known, but no one had a good explanation for it.

Airs Sunday, December 26 at 8:00 p.m.
An updated version of a public radio tradition hosted by NPR's Lisa Simeone. Master comedian Jonathan Winters presents a distinctive reading of Dickens' holiday classic, with a special performing edition prepared by Dickens for his own presentations. Also featuring Mimi Kennedy. From NPR and KCRW 

Airs Sunday, December 25 at 5:00 p.m.
     "The Christmas Revels: In Celebration of the Winter Solstice" is an all-new compilation of musical excerpts, plus a few short poetry and prose readings, selected from the Christmas/Winter Solstice Revels celebrations that took place in December, 2009, in ten cities across the United States.