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2. Hourglass - Wikipedia

   en.wikipedia.org/wiki/Hourglass

   Hourglass. An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand) from the upper bulb to the lower one due to gravity.

3. List of largest hourglasses - Wikipedia

   en.wikipedia.org/wiki/List_of_largest_hourglasses

   List of largest hourglasses. This article lists the largest hourglasses that have been built. Image. Info. Duration. Built in 2000, this hourglass is located in Ybbsitz and is called Panta Rhei. [1] Built in 1984 and located in Mainz, this hourglass was donated by Schott Glaswerke.

4. Time Enough at Last - Wikipedia

   en.wikipedia.org/wiki/Time_Enough_at_Last

   The Twilight Zone (1959 TV series, season 1) List of episodes. " Time Enough at Last " is the eighth episode of the American anthology series The Twilight Zone, first airing on November 20, 1959. [1] The episode was adapted from a short story by Lynn Venable, [2] which appeared in the January 1953 edition of If: Worlds of Science Fiction.

5. 12 Things You Can Get Rid of in 1 Hour - AOL

   www.aol.com/12-things-rid-1-hour-210000149.html

   Unless you plan on replacing the lenses in your old prescription eyeglasses, donate them. You can find drop-off locations at most big box stores or ask your optometrist if they know of a place ...

6. Speed of light - Wikipedia

   en.wikipedia.org/wiki/Speed_of_Light

   For example, for visible light, the refractive index of glass is typically around 1.5, meaning that light in glass travels at c / 1.5 ≈ 200 000 km/s (124 000 mi/s); the refractive index of air for visible light is about 1.0003, so the speed of light in air is about 90 km/s (56 mi/s) slower than c.

7. Mirror - Wikipedia

   en.wikipedia.org/wiki/Mirror

   A mirror reflecting the image of a vase A first-surface mirror coated with aluminium and enhanced with dielectric coatings. The angle of the incident light (represented by both the light in the mirror and the shadow behind it) exactly matches the angle of reflection (the reflected light shining on the table). 4.5-metre (15 ft)-tall acoustic mirror near Kilnsea Grange, East Yorkshire, UK, from ...