How Bitcoin solved the double-spending problem

Bitcoin tackled the problem of spending digital money twice

Digital information can be copied, creating a problem for digital money: how do you stop someone from spending the same unit twice? Bitcoin used a blockchain to solve this without a trusted middleman, creating the first widely used decentralized cryptocurrency.

Total solar eclipses will not last forever

Hundreds of millions of years ago, eclipses could only be total. The Moon’s orbit is slowly carrying it away from Earth, while the Sun’s apparent size grows. Eventually, the Moon will no longer cover the Sun completely.

A fully eclipsed Moon can appear at sunrise

During a total lunar eclipse, the Sun and fully eclipsed Moon can appear above opposite horizons at once, just after sunrise or before sunset. Air bends their light, making both appear higher in the sky. This sight is called a selenelion, not a separate celestial event.

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How Bitcoin solved the double-spending problem

Bitcoin tackled the problem of spending digital money twice

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