Are U.S. Nuclear Plants Ready for a Fukushima-Like Meltdown?

The Golden Gate Bridge opened to traffic on May 27, 1937. This weekend, 75 years later, San Francisco plans to celebrate while honoring the engineer whose contributions to the design were purposefully obliterated: Charles Ellis. Spencer Michels delves into Ellis' story, and into the man who did get the credit -- Joseph Strauss.

One year ago, a tornado packing 200 mph winds tore through the city of Joplin, Mo., killing 161 people and destroying 8,000 buildings -- including many homes. Gwen Ifill and businesswoman Jane Cage, who leads the Citizens Advisory Recovery Team, discuss life in Joplin now and down the road.

After several delays -- including a last-second abort on Saturday when computers spotted a bad engine valve, Space Explorations Technologies Corporation on Tuesday became the first private company to send a vessel to the International Space Station. Jeffrey Brown and Miles O'Brien discuss the significance of the SpaceX launch.

Space is hard and unforgiving and there is still a lot of challenging work ahead for the SpaceX Dragon team. But this is a moment to savor.

Collecting DNA samples isn't easy when your subject could snap off your hand with one bite, but it's a risk David Ray -- a researcher at Mississippi State University -- and his team are willing to take, as they wrestle alligators and crocodiles in hopes of finding answers in these animals' genes.

Clay Johnson, author of "The Information Diet: A Case for Conscious Consumption", discusses with Hari Sreenivasan how abundant technology affects our health -- producing pulsing side effects such as "email apnea" or "reality dysmorphia."

Founded in 2005, Facebook's social network has changed our relationships with friends, family and co-workers, created a new playground for politics, and altered the rules for media, culture and advertising. This timeline chronicles the evolution of the social media giant.

On Saturday, if all goes as planned, the privately owned spaceflight company SpaceX will launch its Dragon capsule into low-Earth orbit and three days later dock with the International Space Station.

Researchers have shown that patients paralyzed from the neck down can move robotic arms with their minds, according to a new report in the journal Nature that documents two cases involving brain-stem stroke victims. Margaret Warner discusses the hopes for the technology with Dr. Leigh Hochberg of Massachusetts General Hospital.

On April 12, 2011, a 59-year-old woman with a sensor implanted in her brain picked up her cinnamon latte with a robotic arm, brought it to her lips and took a sip through a straw, using only her thoughts.