howtogeek — 2013-06-19T13:39:02-04:00 — #1
harv — 2013-06-20T08:12:39-04:00 — #2
The only rock? What about meerschaum?
ladyfitzgerald — 2013-06-20T08:43:33-04:00 — #3
Not all meerschaum floats. The meerschaum that does float isn't as buoyant as most pumice.
harv — 2013-06-20T09:07:12-04:00 — #4
I know not all meerschaum floats, the point is that pumice is not the only rock that floats.
mhenriday — 2013-06-20T11:05:32-04:00 — #5
Not a particularly good idea to attach one's message to pumice if the intended recipient is any distance away - it quickly becomes waterlogged and then sinks....