Some Paleo Diet believers think neither food nor humanity has evolved but anthropologists disagree. They have found that diets were a 'game changer' in ancient African hominid evolution, even 3.5 million years ago.

Tests on tooth enamel indicate that prior to about 4 million years ago, Africa's hominids were eating essentially chimpanzee style, likely dining on fruits and some leaves, said University of Colorado Boulder anthropology Professor Matt Sponheimer, lead author of the study. Though grasses and sedges were readily available back then, the hominids seem to have ignored them for an extended period. 

In October 2014 and February 2016 Proxima Centauri, the red dwarf star nearest to our sun, passes in front of two other stars. Astronomers plotted Proxima Centauri's precise path in the heavens and predicted the two close encounters using data from NASA's Hubble Space Telescope, meaning two opportunities in the next few years to hunt for Earth-sized planets around it.

Red dwarfs are the most common class of stars in our Milky Way galaxy. Any such star ever born is still shining today. There are about 10 red dwarfs for every star like our sun. Red dwarfs are less massive than other stars. Because lower-mass stars tend to have smaller planets, red dwarfs are ideal places to go hunting for Earth-sized planets.

You've heard of obsessive compulsive disorder (OCD) but less well-known is canine compulsive disorder (CCD).  The causes of OCD, which affects about 2 percent of the population, are unknown and the disorder often goes untreated or undiagnosed for decades. People with OCD often exhibit repetitive behaviors or persistent thoughts that are time consuming and interfere with daily routines.