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Probably the most widely posted kid's science experiment on KZfaq but it's the same old example over and over. The egg in the bottle demonstration can be a great investigation of atmospheric pressure used as a STEM activity.Here are some additions that can be made to make it more interesting. Ideas include lengthening the mouth of the bottle, measuring the pressure change. In fact, this doesn't even have to be done with eggs, or how about doing the experiment without any change in temperature, no hot gases cooling or steam condensing to back to water.