As reported by IFL Science, some of these structures may have formed billions of years ago and have withstood the dynamic movements of the Earth's mantle. "We think that the anomalies in the lower ...

In the case of our 'string around the Earth' puzzle, the radius is being increased by 15cm, so we need to know that as a fraction of the original radius. So what is the radius to start with?

jigsaw and trivia to solve puzzles as you explore the world of National Geographic. This edition of Bonza highlights themes like Animals, Travel, Planet Earth, Humanity and Science. Based on the ...