The question Can I compute the mass of a coin based on the sound of its fall? has appeared on the Physics Today Facebook page.
Well done to all who contributed to that question. It has to be good for the Physics SE to get this sort of publicity.
I've been periodically annoyed by the 200 rep/day limit, but poor alemi has been stung by it big time - that limit has cost over 1000 rep points. Can the mods pull a string somewhere?