Video: What actually is octane?

When most of us go to the gas station, we choose regular or premium gas without thinking too much about it.

Secondary cratering on Earth: The Wyoming impact crater field

Several dozen small impact craters, 10-70-m in size, have been discovered in southeastern Wyoming. A team of U.S. and German geoscientists found these ancient craters in exposed sedimentary layers from the Permian period ...

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