Eigengrau (German: “intrinsic gray” / literally: “own gray”), also called Eigenlicht (“intrinsic light”), dark light, or brain gray, is the uniform dark gray background that many people report seeing in the absence of light. The term dates back to the nineteenth century, but has rarely been used in recent scientific publications. Nowadays, the phenomenon is more commonly referred to as “visual noise” or “background adaptation”.
Expiration Dates, Explained - Here’s some food for thought: Expiration dates refer to quality and freshness of food, not safety. (Yep, that’s a shocker!) So even if a food item passes its expiration date, that item could technically still be safe to eat. We dug a little deeper to find out what different types of “expiration” dates really indicate, and if they can be useful for consumers.
Paranthropus boisei was first discovered by Mary Leaky in 1959 and was first termed Zinjanthropus boisei or Zinj. The oldest Paranthropus boisei was found at Omo, Ethiopia and dates to approx 2.3 Ma, while the youngest was found at Olduvai Gorge, and dates to approx 1.2 Ma. P. boisei is best known for its enormous postcanines, & seems to be the end point of a lineage that was adapted to high masticatory stress needed to deal w/hard low-quality food