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The Origins of Thumbs Up or Down: Life or Death
Thumbs up in some cultures is a sign of approval, while in others, it is a sign of disrespect. Where did it come from?
The...
From Papyrus to Paper
Papyrus is an Egyptian water plant that has enabled man to preserve from oblivion the records of dynasties long since passed into history. The...
Qanats: Ancient Underground Aqueducts
Approximately 3000 years ago, clever technicians in the Middle East developed a method for moving water that was reliable, ecologically sound, pollution-free, long-lasting and...