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String girdling Earth is a mathematical puzzle with a counterintuitive solution. In a version of this puzzle, string is tightly wrapped around the equator of a perfectly spherical Earth. If the string should be raised 1 metre (3 ft 3 in) off the ground, all the way along the equator, how much longer would the string be?
String girdling Earth: Image title: Visualisation of the String girdling Earth puzzle showing that the length added to the circumference (cyan) is dependent only on the additional radius (red) and not the original circumference (black), by CMG Lee. Width: 100%: Height: 100%
String girdling Earth, another problem where the radius of a sphere or circle is counter-intuitively irrelevant; References Further reading ...
For example, on Earth Day in 2012, more than 100,000 people in China rode their bikes in order to reduce CO2 emissions and highlight the amount of pollution emitted from cars. About a billion ...
A college student in a gas mask "smells" a magnolia blossom during the first Earth Day on April 22, 1970 in New York City. Credit - AP. M ore than 8 billion people inhabit Earth, and soon a ...
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Celebrate Earth Day 2024 with these inspiring sayings about honoring nature and the environment. Share famous quotes from world leaders, activists and writers.
Earth Day is an annual event on April 22 to demonstrate support for environmental protection.First held on April 22, 1970, it now includes a wide range of events coordinated globally by EARTHDAY.ORG (formerly Earth Day Network) [1] including 1 billion people in more than 193 countries.