Rescue efforts continued Tuesday to uncover survivors from the tornado that came through Moore, OK. It has been preliminarily declared a category F4, that is Fujita Scale 4. The system of rating tornadoes was developed by Ted Fujita, a scientist from Japan.

A post-Fukushima effort to crowdsource radiation data in Japan has since become the largest source of radiation data in the country. And it’s now set to expand to other parts of the world. Catherine Winter reports from Tokyo.

Slideshow: Safecast’s bGeiges

In the midst of a security vacuum, a looming economic crisis and a political stalemate in Egypt, no one is paying much attention to culture. If and when they do, artists don’t expect much encouragement from the new Islamist government. But for the moment, they are taking advantage of a new margin of freedom, using public spaces and trying to reach wider audiences.

The European Union has passed a law banning unlabeled olive oil flasks and dipping bowls, the kind traditionally seen in restaurants in Spain. Instead, restaurants must offer sealed, clearly labelled throw-away oil containers.

There’s a new study out about the risk of ocean pollution caused by shipwrecks. The National Oceanic and Atmospheric Administration has come up with a map of the many, many shipwrecks that dot US coastal waters.

Ray Manzarek, keyboard player and founding member of the 60s rock band The Doors, has died aged 74. Marco Werman gives Manzarek a send-off with some of the sounds he helped influence from Togo, Nigeria and Cuba.

Ahlam is a 28-year-old medical resident from Syria. She came to the US late last year to give birth to her daughter. Her family in New York is pressing her to stay, but she left her husband behind in Syria. Now she has to decide whether to stay in safety or go back.

After decades of dreaming and scheming, companies say they’re finally ready to start mining the bottom of the world’s oceans for valuable minerals. Christopher Werth reports from London on one company’s plans, how environmental scientists view the prospect of digging up the sea floor, and how Howard Hughes and the CIA helped pave the way.