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The first big slide took place in a theatre in Paris in the 1790s after the Revolution. After waiting for a few minutes in total darkness with the eerie background music of a glass harmonica, the audience begins to see various shapes appear in the sky, which appear to be light and shadow patterns floating and gliding through the air. These ghosts are pale and lifelike, and can talk, shout, and cry. One of the ghosts is a bleeding nun, first coming closer and then gradually moving away. Later slides involve the ghosts of recently deceased public figures, who are said to have been summoned by the power of science. Because that's how these shows are marketed: it's an intersection between science and religion, faith and enlightenment. They're scary, but they're also hilarious.

The float glass process was developed in the mid-20th century by Sir Alastair Pilkington, revolutionizing the glass industry. Prior to this method, glass was produced using labor-intensive techniques that often resulted in irregular thickness and surface imperfections. The float process employs a simple yet ingenious technique where molten glass is floated on top of molten tin, creating a perfectly flat surface as the two materials interact. This unique combination allows for the production of glass sheets with unparalleled uniformity and clarity.

1. Enhanced Safety One of the primary advantages of tempered glass is its safety characteristics. In the event of a breakage, tempered glass shatters into small, blunt pieces that are less likely to cause injury compared to standard glass, which can break into sharp shards. This safety feature is crucial in applications like windows, shower enclosures, and glass railings.

Low-e glass panels, also known as low-emissivity glass panels, are a type of energy-efficient glass that can greatly benefit buildings in terms of insulation and performance. These panels are coated with a thin, transparent layer of metal that reflects heat while still allowing light to pass through. As a result, low-e glass panels can help regulate the temperature inside a building, reduce energy consumption, and lower utility costs.