Did you know that Earth Day is considered the largest secular holiday in the world right now? Over one billion people celebrate it. But do you know when Earth Day came about and what events led up to it?

In this episode, Untamed Science explains the origins of Earth Day and gives a short Earth Day challenge for this year’s eco-holiday.

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Untamed Science

Untamed Science

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Note: Fresh Ideas for Teaching blog contributors have been compensated for sharing personal teaching experiences on our blog. The views and opinions expressed in this blog are those of the authors and do not necessarily reflect the official policy or position of any other agency, organization, employer or company.