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When – and why – did people first start using money?

Sometimes you run across a grimy, tattered dollar bill that seems like it's been around since the beginning of time. Assuredly it hasn't, but the history of human beings using cash currency does go back a long time – 40,000 ...

dateJun 20, 2017 in Other
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How drones are advancing scientific research

Drones, or unmanned aerial vehicles (UAVs), have been around since the early 1900s. Originally used for military operations, they became more widely used after about 2010 when electronic technology got smaller, cheaper and ...

dateJun 19, 2017 in Engineering
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