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What Is Radiation?
What Is the Corona of the Sun?
How Do We Know What Is at
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America ancient animals aqualung areas balloon became believed birds blood body brain breathe brown rat called calories carbon carbon dioxide cells century chemical chromium climate cloth coal color countries developed diamonds disease diving duckbill eagle early earth eels eggs Egyptians energy England Europe example eyes falconry feet fibers fire fish fuel galaxies gases Geiger counter gold Greeks grow hair heat horseshoe crab human hummingbird hundred inches insects insulin iodine kapok kind known land layer learned light live lizards machines means metal miles milk million mollusk move muscles mussels ocean operetta orange organs oxygen pellagra person Pinnipeds plankton plants plow probably produce radiation radio rock Romans scientists shell ships skin snakes soil sometimes surface temperature things tiny trees tube United uranium usually Vatican City vitamins waves wheel wood word Yiddish