In Rhode Island, a 25-year-old woman gave a new meaning to the phrase ‘feeling blue’. She developed a rare and sometimes incurable condition called methemoglobinemia that turned her blood a shade of navy blue. The case was described on Wednesday ...

About half a billion years ago, on Earth, there was a massive explosion of species development causing the biodiversity of animals to amplify noticeably, but the actual of that event has remained a mystery till now. On Wednesday, in a ...