5:55 p.m. ET: DEVELOPING: Lufthansa and United Express planes clipped each other on a taxiway at Dulles Airport, causing no apparent injuries, officials told ABC News affiliate WJLA.

Credit: Getty Images

Read the story as it develops HERE

4:42 p.m. ET: AP published this photo of Carmelita Jeter, anchor of the US Women's relay team, pointing to their world record time.

Courtesy of AP

4:02 p.m. ET: 'Nightline' Anchor Bill Weir tweets:

1:22 p.m. ET: Here's a shocking medical mystery…

Shanyna Isom has consulted every possible specialist, including a doctor in the Netherlands, but she still as no idea what is wrong with her.

The 28-year-old beautician and former University of Memphis law student has developed a condition so severe, fingernails grow from the hair follicles all over her body.

Credit: Handout/Shanyna Isom

Read the full story HERE

12:17 p.m ET: While wetter weather is finally rolling through the drought-stricken Midwest, it's too little too late for the nation's corn crop, Reuters reports.

Courtesy of AP/SA

As the worst drought in over a half century took its toll, investors went on a buying spree, boosting corn prices by more than 50 percent from late May to fresh record highs above $8 per bushel. The U.S. government on Friday released fresh crop data that revealed shocking cuts for this year's grain and oilseed output as the drought spread through America's breadbasket.

Read the full story HERE

11:25 a.m. ET: Storm chaser and respected scientist Tim Samaras is on a quest to document the birth of a lightning strike. Photographer Carsten Peter tagged along with the storm chaser for National Geographic magazine. Get a sneak peek of his photos HERE

"Nightline" recently caught up with Samaras as he chased lightning across New Mexico, Kansas, Oklahoma and Colorado. See the photos of journey HERE

Credit: ABC News