By examining the fossil teeth of prehistoric horses, scientists have been able to learn more about how the climate changed millions of years ago. They analyzed oxygen and carbon isotopes contained in the samples; oxygen isotopes told the scientists at what temperature the teeth were formed and carbon isotopes revealed the relative humidity, the University of Florida said in a statement.
Using isotope data and precise locations and dates for the fossil teeth, the researchers were able to pinpoint the details of the transition, the biggest climate change since the end of the dinosaurs about 65 million years ago. Read more
(Pop quiz, readers! How old is the horse in the photo?)