"Humpback whales don't just sing songs — they compose with the whales around them, singing a song that evolves over time. Scientists didn't know that until they started recording whale sounds in the 1960s and spent years listening."

"Millions of people around the world are experiencing a scorching summer, as records are broken and thermostats climb this week in parts of Europe. Temperatures in Paris and Brussels exceeded 90 degrees Fahrenheit at a time of year when 70-degree weather is the norm, according to Accuweather.com."

"Dolphins tend to strike a deep emotional chord in many people who encounter them. Famous for their intelligence and physical ability, there have been reports that the marine mammals have come to the rescue of humans at sea."

"United Nations' Secretary-General Ban Ki-moon applauded the Obama administration's power plant rule at a visit to the White House on Tuesday."

"PARIS -- Glaciers worldwide have shrunk to levels not seen in 120 years of record-keeping, with melting accelerating in the first decade of the 21st century, according to a study released yesterday."

"LAHAINA, Hawaii — Trade ministers from a dozen Pacific Rim nations failed to reach a deal on a new trade agreement that would cover nearly 40 percent of the global economy, U.S. Trade Representative Michael Froman said Friday."

"Among the questions raised by Beijing's bid for the Winter Olympics was this one. Where are they going to get the snow? In its evaluation of the bid, the Olympic Committee noted minimal snowfall in the area, so the games, they concluded, will rely completely on artificial snow. And they acknowledge that northern China suffers from severe water stress and that the Beijing-Zhangjiakou area in particular is becoming increasingly arid."

"A highly unusual clinical trial in Guinea has shown for the first time that an Ebola vaccine protects people from the deadly virus. The study, published online today by The Lancet, shows that the injection offered contacts of Ebola cases 100% protection starting 10 days after they received a single shot of the vaccine, which is produced by Merck. Scientists say the vaccine could help to finally bring an end to the epidemic in West Africa, now more than 18 months old."

"The killing of Cecil the lion by a U.S. hunter in Zimbabwe has turned up the pressure on Washington to extend legal protection to the African lion by declaring it an endangered species, but some hunting advocates said that would lead to more regulations that could ultimately harm the big cats."

"As outrage grows over the killing of Cecil the lion, Zimbabwe has called on the United States to extradite the American dentist who shot the prized big cat this month."