Sometimes you may notice that your menstrual blood becomes dark brown or almost black as you near the end of your period. This is a normal colour change. It happens when the blood is older and not being expelled from the body quickly. Temporary thick heavy flow isn't necessarily a cause for concern.
Meaning that the remaining 96% of the internet is made up of “The Deep Web”. ... If you are looking to access hidden marketplace's or darknet websites (with a .onion domain) then dark web access is done using the TOR network with the TOR browser bundle. TOR is the most widely used dark web browser.Jan 28, 2018
“The crab only needs to see one dark spot moving in its upward vision to know it must run for its burrow,” Jan says. ... The beach where they live is drenched in ultraviolet light, and the team has found that crabs can see in the near ultra-violet as well as other colours.Oct 26, 2009
The most common answer to the question, “Why was Africa called the Dark Continent?” is that Europe did not know much about Africa until the 19th century, but that answer is misleading. ... They called Africa the Dark Continent, because of the mysteries and the savagery they expected to find in the “Interior”.Jun 18, 2016
Rabbits' eyes are adapted to being able to see moderately well in half-light conditions rather than extremely well in either light or dark. This is because they are crepuscular, that is, preferring to be active at dawn and dusk, when natural light is dim.