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Why Mint is Cold, and Pepper is Hot

Anyone who has ever tasted peppermint or gum is familiar with the feeling of coldness in the mouth. But few people know why there is a pleasant chill in the mouth?

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Who invented the paper clip?

The paper clip is a stationery item that everyone has held at least once. But people think little about who invented it, and something connected what interesting events with this minor detail for fastening documents

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Waste disposal

Industrial and household waste is the main garbage produced by humanity. To keep it from emitting harmful substances, it needs to be disposed of. The greatest amount of waste is produced by the coal industry and metallurgy

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Why aren’t the letters on the keyboard in alphabetical order?

The arrangement of letters on a computer keyboard is a legacy of typewriters that appeared in the 19th century.

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