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Crepuscular rays

Crepuscular rays are rays of sunlight that appear to radiate from the point in the sky where the sun is located. These rays, which stream through gaps in clouds or between other objects, are columns of sunlit air separated by darker cloud-shadowed regions. Despite seeming to converge at a point, the rays are in fact near-parallel shafts of sunlight. Their apparent convergence is a perspective effect, similar, for example, to the way that parallel railway lines seem to converge at a point in the distance.

The Ice Block Expedition Of 1959

The Ice Block Expedition Of 1959 was a publicity stunt carried out by the Norwegian insulation material producer Glassvatt. Responding to a challenge from the radio station Radio Luxembourg, Glassvatt decided to equip a truck to bring a three-ton block of ice from the Arctic Circle to the Equator. There was no form of refrigeration applied, and the expedition was intended to display the efficiency of the insulating glass wool used. Crossing the Sahara, where the truck repeatedly got stuck in the sand, proved both a dangerous and laborious task. Once the truck had made it through the desert, however, and reached its final destination, it was revealed that the ice block had lost no more than 11% of its original weight. The expedition was an enormous success, judged both by the end result and by the media attention generated for the company, and has been called “the world’s greatest publicity stunt”.