Longitudinal fissure Longitudinal fissure The longitudinal fissure (or cerebral fissure, median longitudinal fissure, or interhemispheric fissure) is the deep groove that separates the two hemispheres of the vertebrate brain. The medial surfaces of the two hemispheres are as similarly convoluted by gyri and sulci as is the outer surface of the brain. It is thought that a majority of existing animals, including Homo sapiens, have evolved from a common wormlike ancestor that lived around 600 million years ago, called the urbilaterian. A bilaterian animal is one that has symmetrical left and right body halves. While it is still debated whether this species
Mermaids: The Body Found program. Mermaids: The Body Found Mermaids is a science fiction program styled as a documentary originally aired as Mermaids: The Body Found on American TV channels Animal Planet (May 27, 2012) and Discovery Channel (June 17, 2012). It tells a story of a scientific team's investigative efforts to uncover the source behind mysterious underwater recordings of an unidentified marine body. The show presents the controversial aquatic ape hypothesis as evidence that mermaids exist, along with a digitally manufactured video. A sequel broadcast called "Mermaids: The New Evidence" aired May 26, 2013. "Mermaids: The Body Found", its sequel "Mermaids: The New