AP - A Japanese man who developed the world's smallest helicopter will take flight in the birthplace of Leonardo da Vinci in tribute to the Renaissance genius' original idea.
AP - While carbon dioxide has been getting lots of publicity in climate change, reactive forms of nitrogen are also building up in the environment, scientists warn. -- read full article
AP - The El Nino phenomenon that has puzzled climate scientists in recent decades may have assisted the first trip around the world nearly 500 years ago.
