There is a 600 year old 240 paged book called the Voynich Manuscript, that’s written language is still completely unknown today.
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The universally popular Hershey bar was used overseas during World War II as currency.
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There was a bear called Wojtek who was adopted by Polish soldiers during WW2. It carried ammunition, wrestled with soldiers, and drank beer.
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Leonardo Da Vinci made a robotic lion in 1515 that would walk, sway, open its mouth and move its tail - it even had a compartment that opened to present flowers.
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France’s King Louis XIV was offered biological weapons by an Italian chemist. He not only refused, but also paid the chemist an annual salary to never reveal the technology to anyone else.
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Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
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