Mars will shine close to the blue star Spica at sunset on Sept. 13, but you'll need a clear view of the western horizon to catch the colorful duo before they slip swiftly out of view. Look west as the ...
Everyone on earth takes a private vote by pressing a red or blue button. If more than 50% of people press the blue button, everyone survives. If less than 50% of people press the blue button, only ...
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