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The Old Nassau reaction or Halloween reaction is a chemical clock reaction in which a clear solution turns orange and then black. This reaction was discovered by two undergraduate students at Princeton University researching the inhibition of the iodine clock reaction (or Landolt reaction) by Hg 2+ , resulting in the formation of orange HgI 2 .
The Hawthorne effect is a type of human behavior reactivity in which individuals modify an aspect of their behavior in response to their awareness of being observed. [1] [2] The effect was discovered in the context of research conducted at the Hawthorne Western Electric plant; however, some scholars think the descriptions are fictitious.
Giambattista della Porta was a 16th-century Neapolitan scientist and scholar who is credited with a number of scientific innovations. His 1589 work Magia Naturalis (Natural Magic) includes a description of an illusion, titled "How we may see in a Chamber things that are not" that is the first known description of the Pepper's ghost effect.
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The history of Halloween is spookier than you know. Witches, ghosts, and costumes all play a part in Halloween's history, but why do we celebrate it? Learn more about the history of the October 31 ...
Halloween this year poses unique risks. In 2020, a night of trick-or-treating entails social distancing and handling children who've been cooped up at home for months. What's more, Halloween is a ...
A long snake-like shape of carbon formed during the experiment "Black snake" is a term that can refer to at least three similar types of fireworks: the Pharaoh's snake, the sugar snake, or a popular retail composition marketed under various product names but usually known as "black snake". The "Pharaoh's snake" or "Pharaoh's serpent" is the ...
Of course Halloween has morphed into a multi-billion dollar industry, a day for trick-or-treating, parties and festive gatherings. Spooky good times: 5 fun ways to celebrate Halloween with ...