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Sometimes reducing your home's energy use can be as simple as opening a window or buying tape. Here are five easy ways to have a more climate-friendly home and save on energy bills at the same time.

Researchers in Tokyo have put a new twist on the use of sound to suspend objects in air. They've used ultrasonic standing waves to trap pieces of wood, metal and water – and even move them around.

Beijing announced it was creating an "air defense identification zone" in a disputed area, but the U.S. flights challenge China's claim. In other news, Russia detains alleged Islamist militants. And a school exam question on rape prompts complaints in South Africa.

The Supreme Court has agreed to review an Obama administration policy that requires new power plants and other big polluting facilities to apply for permits to emit greenhouse gases. Industry groups argue that getting these permits causes delays in big projects that could help revive the economy.

Blue skies and calmer seas mean divers can enter the water to look for bodies. Also a source close to the investigation says radar shows the jet climbed steeply before crashing into the Java Sea.

Authorities also released audio of the conversation between the pilot and the airport's communications tower during the doomed plane's final moments on Monday. Only six of 77 people aboard survived.

Comedian Michelle Wolf's controversial routine at the White House Correspondents' dinner on Saturday has prompted backlash from both sides of the aisle. NPR's Mary Louise Kelly and Audie Cornish preview an interview with Wolf airing tomorrow on WHYY's "Fresh Air."

As a former foreign correspondent who's visited 82 countries and traveled nearly 2 million miles, Nicholas Kralev has felt the pain of air travel — but he's also learned its secrets. He shares his tips in Decoding Air Travel.

The incident marks the second time in less than a month that an unticketed passenger was discovered on a Delta Air Lines flight, this time en route to Hawaii.

Today, sound recording has totally changed and magnetic tape technology has all but been abandoned. Or, so one would think.