回旋陀螺
回旋陀螺，又称凯尔特石头，是一个半椭圆形的陀螺．它会往特定的方向旋转；但是，当被往反方向转时，它会变得不稳定，摇晃，停止，然后又转换往原来特定的方向旋转。
这种旋转－反旋转的运动现象，似乎违反了物理学上的角动量守恒定律。更不可思议的是，当我们将回旋陀螺往它特定的方向转，大多数的回旋陀螺，不会发生这种特别的现象；反方向却会。这两个特性使回旋陀螺成为了一个很稀罕的物品，自从史前以来，就引起了无数人的想像力。
Rattleback
中文百科
英语百科
Rattleback 回旋陀螺
A rattleback is a semi-ellipsoidal top which will rotate on its axis in a preferred direction. If spun in the opposite direction, it becomes unstable, "rattles", stops and reverses its spin to the preferred direction.
This spin-reversal appears to violate the law of the conservation of angular momentum. Moreover, for most rattlebacks the motion will happen when the rattleback is spun in one direction, but not when spun in the other. Some exceptional rattlebacks will reverse when spun in either direction. This makes the rattleback a physical curiosity that has excited human imagination since prehistorical times.
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