TRENO Tip: Safety in the Sun!

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Warning: A round plastic bottle filled with clear water can act as a lens that concentrates the sun’s energy on one point; and if that focal point is combustible, then fire can result.  To avoid the risk, carry your bottle of water with you instead of leaving it in an overheated car. Or cover the bottle or stash it under a seat so it is out of the sun. Given the right kind of plastic container and the right environmental conditions, sun shining through a water bottle can indeed lead to combustion.