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Do you want to entertain your kids during breakfast on Sunday? Take a very high jar of liquid honey and a number of small identical spherical beads, e.g. millimeter steel balls from a ball bearing. Prepare the beads before starting: mix them with a small amount of honey. Next, take into your fingers a triplet of the beads `glued' by the sticky liquid. Try to keep them as close to each other as possible and in a vertical plane, put above the open jar and then release and let them fall into honey. Guess what will you see? We present dancing beads, which try to perform periodic relative motions while settling down under gravity in a very viscous fluid . The snapshots shown below start at time t=0 and finish at t=T/6 (T is the period of the oscillations). The configurations at t=T/6 are almost the mirror images of the ones at t=0 (the mirror is vertical), except a permutation of particles. Therefore, periodic motions with the period T exist. In experiments, they are unstable and usually break up after a bit longer than 1/6 of the period.

Poster: Experiments with heavy particles in a viscous fluid: amazing oscillations