thermosphere temperature sparse gas heat transfer skin

The thermosphere is hot, but barely warms skin

About 1,500 °C

The thermosphere can reach about 1,500 °C, but its gas is extremely sparse. Its molecules transfer too little energy to a person's skin for that person to feel the high temperature as heat.

Printing money for Ruhr strikers fueled hyperinflation

During France and Belgium’s 1923 occupation of Germany’s Ruhr industrial region, the German government printed money to support striking workers and businesses that had stopped working. The policy helped fuel the hyperinflation that wiped out many German savers’ savings.

A clay tablet may show the Pythagorean rule more than 1,000 years early

A Mesopotamian clay tablet from the 18th century BCE lists number groups such as 3-4-5 and 5-12-13. These numbers fit the relationship later called the Pythagorean theorem, suggesting people knew the pattern more than 1,000 years before Pythagoras.

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thermosphere temperature sparse gas heat transfer skin

The thermosphere is hot, but barely warms skin

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