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Uploaded on Nov 2, 2011
Plants move all of the time - they just don't walk! In fact, it would be hard to find a plant that is not changing shape or actively orienting its leaves and stems all of the time. Charles Darwin was fascinated by the movement of plants and devoted considerable attention to these phenomena in three different books that he wrote: "Climbing Plants," "Insectivorous Plants," and the "Power of Movement in Plants." This is a time--lapse video of a hops plant (Humulus lupulus) taken over a period of several days, allowing us to accelerate the observations that Darwin made in real time on the movements of the shoot system in beer hops. A camera mounted on a tripod captured still photographs of a hops plant in two-minute intervals. Once the shoot system has lost its climbing support, you will see that the rotation of the shoot becomes very extreme. Each rotation of the stem is roughly three hours long.