▶ Start a Fire by using a Water Bottle as a magnifying glass - YouTube. Impressive. Plastic bag can be used with due care and skill. Urine can be used if desperate! Practicing this system before your life depends on it is advised.
Solar thermal lens for substantial solar concentration using water & clear plastic sheet as lens. ................Impressive! ...Effective and cheap. Useful in a "survival" situation IF plastic sheet available. SOLAR DEATH RAY WATER aqua lens with 1/3 Kilowatt Heat Energy - YouTube
Pouring Lava onto ice to examine its properties. It's difficult for geologists to witness the flow of lava on snow- and ice-covered volcanos, so researchers with the Syracuse University Lava Project decided to create their own simulation, melting 300 kg of lava and pouring it over ice to watch the effects.
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