-I can understand why droplets of water "float" on a hot surface. The effect was already discovered in 1751, by mister Leidenfrost, and bears the eponymous name, the Leidenfrost effect.
Here one can see that droplets of water run upwards as if they climb a ladder. How does this work? How do the droplets grab themselves to the next step and pull themselves up? In the video, no explanation is given.
It is clear that energy is given to the droplets by the hot underground and the same effect (climbing droplets) can be seen as kinetic energy is given to the droplets by shaking the underground, or varying the cohesiveness of the underground (see here). I'm interested though only in the case where the Leidenfrost effect is at work. How can the droplets move up?