It was the first meteorite in the Egyptian record. Years after the event, scientists concluded through various tests that it came all the way from Mars.
Don't call it a swimming dinosaur, scientists say. The newly discovered ichthyosaur looks much like a dolphin or shark and swam Earth's seas for millions of years.
Great land plates shifted and came together - 55 million years ago - to create the Tibetan Plateau, the highest and largest plateau in the world today.
Global warming will cause more people to be exposed to the mosquito that carries Zika virus, says a new study. Why this mosquito is such a good virus-spreader.
The recent El Niño has driven a rise in atmospheric CO2. Scientists expect it to surpass 400 parts per million for the year and stay there at least a human lifetime.