Preparing for an Asteroid, Cicadas Collective Roar Compares to Jet Engine & TDIH: The First Polio Vaccine is Released
Earth’s upcoming close encounter with an asteroid which will be 10 times closer than our own moon and Scientists plan to study it, the cicadas are here and wreaking havoc in South Carolina, plus, on This Day in History, mass trials of the Polio vaccine are distributed.
Asteroid (Gizmodo) (MSN)
Cicadas (AP News)
Polio Vaccine (Britannica) (NPR)
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