Have you ever noticed a change in the \”whistle” a train makes as it rushes by? If you stand by the tracks while the train is passing, the sound gets higher and then lower as the train goes by you. …
Is there a river that runs backwards? Is there a place where people grow a plant that is a food and that can also be used to make blankets? Is there a road that’s long enough to reach around the…
The plants that grew on earth hundreds of millions of years ago didn’t look much like the plants we see around us today. Scientists have learned a great deal about what the world was like long ago….
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