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Granular convection is a phenomenon where granular material subjected to shaking or vibration will exhibit circulation patterns similar to types of fluid convection. [2] It is sometimes called the Brazil nut effect , [ 3 ] when the largest of irregularly shaped particles end up on the surface of a granular material containing a mixture of ...
A classic symptom is a characteristic fine tremor in the hands, which is traditionally described as a "pill-rolling" action of the hands, [3] but Parkinsonian tremor may also affect the arms, chin, lips, legs, and trunk, and can be markedly increased by stress or emotion. Onset is generally after age 60.
Actress Katharine Hepburn (1907–2003) had an essential tremor, possibly inherited from her grandfather, [93] that caused her head—and sometimes her hands—to shake. [ 94 ] [ 95 ] [ 96 ] The tremor was noticeable by the time of her performance in the 1979 film The Corn Is Green , when critics mentioned the "palsy that kept her head ...
Here is a compilation put together in February that exemplifies Trump's "pull" and forceful style of handshake:
Physiologic tremor is a tremor or trembling of a limb or other body part. The recorded frequency is in the range of 8-12Hz. It occurs in normal individuals, especially when they are stressed by anxiety or fatigue.
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A joy buzzer (also called a hand buzzer) is a practical joke device that consists of a coiled mainspring inside a disc worn in the palm of the hand. When the wearer shakes hands with another person, a button on the disc releases the spring, which rapidly unwinds creating a vibration that mimics an electric shock to the unsuspecting victim.
Baseball Hall of Famer Stan Musial used the fist bump during the 1950–60s as an alternative to shaking hands. Musial was convinced that he was catching too many colds by picking up germs while shaking thousands of hands each year, so he adopted the fist bump as a friendly alternative.