From Jenna Orkin As Biden visits Ukraine, China’s top diplomat goes to Russia Putin says Russia will suspend role in New START nuclear accord with U.S. Discovery of Two New Forms of Salt Water Could Rewrite Fundamental Chemistry Ohio metal alloy factory explosion kills 1, injures more than a dozen others Supreme Court ruling creates turmoil over gun laws in lower courts Germany reports rise in Iranian spying since revolt against regime -analysis U.S. states struggle to share dwindling waters of Colorado River Exclusive: Huge chunk of plants, animals in U.S. at risk of extinction The easiest ways to compost — even if you never thought you would A Japan Airlines flight was turned away and had to fly 550 miles back to Tokyo after missing an airport's closing time by 10 minutes, report says