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The bright initial flash of a nuclear weapon is the first indication of a nuclear explosion, traveling faster than the blast wave or sound wave. [6] "A 1-megaton explosion can cause flash blindness at distances as great as 13 miles (21 km) on a clear day, or 53 miles (85 km) on a clear night.
The human eye can function from very dark to very bright levels of light; its sensing capabilities reach across nine orders of magnitude.This means that the brightest and the darkest light signal that the eye can sense are a factor of roughly 1,000,000,000 apart.
To experience this phenomenon, one can look at a bright source of light and then look away to a dark area, such as by closing the eyes. At first one should see a fading positive afterimage, likely followed by a negative afterimage that may last for much longer.
This can be seen when the eyes are closed and looking at the back of the eyelids. In a bright room, a dark red can be seen, owing to a small amount of light penetrating the eyelids and taking on the color of the blood it has passed through. In a dark room, blackness can be seen or the object can be more colourful.
Dark Dark Dark is an American folk band from Minneapolis, Minnesota. Formed in 2006, the band has toured extensively in the United States and Eastern Asia and are known for their blend of New Orleans jazz , Americana , Eastern European folk and pop .
The Poker After Dark format featured an "intimate look at one table as it develops over the week." [2] Blinds start at $100/$200 and slowly escalate.Commentator Ali Nejad's commentary is limited, allowing viewers to hear much of the table talk among the players, all of whom are mic'ed. [2] (The table talk occasionally reveals that the "week-long" series is taped in one long session.)
The eye and brain "edit out" the shadow lines of the capillaries, partially by dark adaptation of the photoreceptors lying beneath the capillaries. The white blood cells, which are larger than red blood cells, but much rarer and do not absorb blue light, create gaps in the blood column, and these gaps appear as bright dots.
Post tenebras lux is a Latin phrase translated as Light After Darkness. It appears as Post tenebras spero lucem ("After darkness, I hope for light") in the Vulgate version of Job 17:12. [1] Post Tenebras Lux in the seal of the Canton of Geneva