Greenwich meridian adopted zero longitude 1884

Greenwich became the world’s longitude reference

0° longitude

The Royal Observatory at Greenwich was founded in 1675 to help solve how to calculate longitude for navigation. In 1884, its meridian was adopted internationally as 0° longitude.

Beta-carotene supplements do not prevent cancer

Beta-carotene supplements have not been shown to prevent cancer. Among people already at high risk, taking them can actually increase the risk of lung cancer.

Soap helps bubbles last longer even though it lowers surface tension

Pure-water bubbles usually burst quickly because their thin liquid films drain and break. Soap molecules reduce surface tension, but they also help stabilize the film by resisting uneven thinning. That is why adding soap makes it easier to blow long-lasting bubbles. Lower surface tension does not automatically mean a weaker bubble.

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Greenwich meridian adopted zero longitude 1884

Greenwich became the world’s longitude reference

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