99,99999 % of what some neckbearded "Survival Instructor" is telling you (while he is pulling his group through some senseless hike to stretch the time and having an audience for his "When I Was In The Sandbox" stories) you already heard in your school during science class:
The same with this little experiment I staged for my oldest science class and later decided to add to this blog: How to make fire with a hollow mirror aka a reflector headlights.
Enjoy, and please activate the subtitles for this video:
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