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  2. Estrous cycle - Wikipedia

    en.wikipedia.org/wiki/Estrous_cycle

    Anestrus refers to the phase when the sexual cycle rests. This is typically a seasonal event and controlled by light exposure through the pineal gland that releases melatonin. Melatonin may repress stimulation of reproduction in long-day breeders and stimulate reproduction in short-day breeders.

  3. Photoperiodism - Wikipedia

    en.wikipedia.org/wiki/Photoperiodism

    The length of the light and dark in each phase varies across the seasons due to the tilt of the earth around its axis. The photoperiod defines the length of the light, for example a summer day the length of light could be 16 hours while the dark is 8 hours, whereas a winter day the length of day could be 8 hours, whereas the dark is 16 hours.

  4. Edison light bulb - Wikipedia

    en.wikipedia.org/wiki/Edison_light_bulb

    In the 1980s, after watching a salvage operation, Bob Rosenzweig started the reproduction and selling of his faux-antique bulbs. [9] These vintage-style light bulb reproductions were sold mostly to collectors and prop houses, and continued until the turn of the 21st century when new regulations banned low-efficiency lighting in many countries.

  5. Menstruation - Wikipedia

    en.wikipedia.org/wiki/Menstruation

    Diagram illustrating how the uterus lining builds up and breaks down during the menstrual cycle Menstruation (also known as a period, among other colloquial terms) is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. The menstrual cycle is characterized by the rise and fall of hormones. Menstruation is triggered by falling progesterone ...

  6. Daguerreotype - Wikipedia

    en.wikipedia.org/wiki/Daguerreotype

    Depending on the sensitization chemistry used, the brightness of the lighting, and the light-concentrating power of the lens, the required exposure time ranged from a few seconds to many minutes. [ 67 ] [ 68 ] After the exposure was judged to be complete, the lens was capped and the holder was again made light-tight and removed from the camera.

  7. Take a peek inside this 1800s Greek Revival-style home ... - AOL

    www.aol.com/peek-inside-1800s-greek-revival...

    Staicer said of fixtures that seem intentionally placed to light a desk or work table of some sort. “So, we’ve got this set up as an architect’s studio with a mid-19th-century drawing table ...

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