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Alfredo Moser's Lightbulb Moment

• arclein
So how does it work? Simple refraction of sunlight, explains Moser, as he fills an empty two-litre plastic bottle. "Add two capfuls of bleach to protect the water so it doesn't turn green [with algae]. The cleaner the bottle, the better," he adds. Wrapping his face in a cloth he makes a hole in a roof tile with a drill. Then, from the bottom upwards, he pushes the bottle into the newly-made hole. "You fix the bottle in with polyester resin. Even when it rains, the roof never leaks - not one drop."

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