In 1918, medical science was at a loss to explain the Spanish flu epidemic, which swept the world in three great waves and killed an estimated 20 to 40 million people in just one year, more than the number ...
There was a time, not too long ago, when people wrote letters (and mailed them), picked up the phone and spoke to people (not voice mail systems) and considered whether to invest in expensive new "fax" ...
Take An Ecowalk 1 Science Concepts is published by Fitzhenry and Whiteside.