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Two galaxies mergingTwo galaxies merging
The changing luminosity of the sunThe changing...
Human population growthHuman population...
The exponential growth of pond scumThe exponential...
The daily consumption of resources per person in the United States.The daily...
World emissions of greenhouse gases per capita in 2005World emissions of...
Cosmic inflation and cosmic expansionCosmic inflation...
“Now Playing--A Reassuring Lie.”“Now Playing--A...

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