In order to release seeds at the most opportune time, pine cones open their scales in warm and dry weather, and remain closed and sealed up when it’s cold and wet. Based on this phenomenon, engineers have created retractable sunshades that can automatically adjust to the amount of sunlight an area gets. What makes these sunshades extra incredible is that they retract without electricity, unlike conventional sunshades.
These retractable sunshades can open and close without using electricity
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