Fun with flashlights by the fire
It's sometimes pleasant to spend an evening in front of a fireplace or campfire with kids. You turn off the TV, the radio, and the lights, and settle down for stories, talk, maybe s'mores. In these cozy surroundings, you can also entertain the kids with some interesting optics demonstrations using nothing more than a flashlight. Depending on your kids' ages and moods, you might stage a few demonstrations or you could simply point out one or two phenomenon.
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