Longtime journalist Wen Stephenson decided he had to become a climate activist. Now he’s back with a message for his former colleagues: You are failing.

An unmanned Russian capsule arrived at the International Space Station today to deliver Halloween treats. Check out a slideshow of photos by American astronaut Sunita Williams.

With more than one billion users, Facebook has more or less conquered the developed world, so now the social media giant is setting its sights on emerging markets in Asia, Africa and Latin America.

It used to be that printing your plane tickets at home was cutting edge. Now companies are using three dimensional printers to quickly create almost anything.

Marketers have hit upon the Holy Grail of advertising: addressable TV ads. That means two households watching the same show will see two different ads.

Apple’s big announcement in San Francisco Wednesday got us thinking: what will the smartphone of the future look like?

We revisit a conversation with Amy Stewart, author of “Wicked Bugs: The Louse that Conquered Napoleon’s Army and other Diabolical Insects.”

Saul Perlmutter’s head isn’t always up in the stars, he’s also fond of places like San Francisco’s Exploratorium Museum where he takes his U.C. Berkeley physics and music students. Here & Now producer Emiko Tamagawa caught up with him there last spring.

Thousands of fish are dying in the Midwest as the summer drought dries up rivers and causes water temperatures to climb in some spots to nearly 100 degrees. Meteorologist Ed Kieser says the plains states are particularly suffering, with only 1/100th of an inch of rain falling in Omaha last month.

The nuclear-powered robotic explorer “Curiosity” has landed on Mars, and is already sending photos of the red planet back home.

If all goes as planned, Curiosity, NASA’s nuclear-powered rover, will touch down early Monday morning in the 96-mile-wide Gale Crater on the fourth planet from the sun.

National security expert James Bamford says the NSA is building a data mining facility in Utah that will vacuum up information from Americans’ e-mails, cellphone calls and Google searches for future use.

Social media is changing the way people are getting information about the 2012 London Olympics. Fans and athletes at the games are tweeting, posting amateur photos on Instagram and criticizing the way the Olympics are covered by traditional media.

Twenty five thousand AIDS experts and activists will descend on Washington DC this weekend for the International Aids Conference. We speak with Dr. Anthony Fauci about a possible cure, and to a 23-year-old American woman whose mother died of AIDS.