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Glass delusion is an external manifestation of a psychiatric disorder recorded in Europe mainly in the late Middle Ages and early modern period (15th to 17th centuries). [1] People feared that they were made of glass "and therefore likely to shatter into pieces".
This thermal quenching may be described by means of a simplified model of a rapidly cooled sphere. [3] Prince Rupert's drops have remained a scientific curiosity for nearly 400 years due to two unusual mechanical properties: [4] when the tail is snipped, the drop disintegrates explosively into powder, whereas the bulbous head can withstand ...
Spontaneous glass breakage is a phenomenon by which tempered glass may spontaneously break without any apparent reason. The most common causes are: [13] [14] Internal defects within the glass such as nickel sulfide inclusions. Nickel sulfide defects can cause spontaneous breakage of tempered glass years after its manufacturing. [15]
Ninja rocks take advantage of the physical properties of tempered glass, disrupting surface compressive stress and causing the glass to shatter. Tempered glass, which is used for the side windows of most vehicles, is manufactured with an extremely high surface compressive stress and high internal tensile stress. This gives it strength and ...
A coin of Agathocles of Syracuse, Sicily, showing three legs with wings and a head in their joining point. The triskelion is a motif with central symmetry used since ancient times. A variant with three human legs appears in the medieval flag of the Isle of Man. A variant with the head of Medusa in the union of the legs is associated with Sicily ...
Image credits: anon Kanan Gupta, an up-and-coming stand-up comedian from India, agrees. “Women love funny men. If you can make a girl laugh, you’re halfway there,” he says.
Annealing is a process of slowly cooling hot glass objects after they have been formed, to relieve residual internal stresses introduced during manufacture. Especially for smaller, simpler objects, annealing may be incidental to the process of manufacture, but in larger or more complex products it commonly demands a special process of annealing in a temperature-controlled kiln known as a lehr. [1]
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