Rocket Mass Heaters in South Africa

Apologies in advance if this is old news, but I want to share a video showing, among other things, a group in South Africa building a Rocket Mass Heater. Seems the word has spread widely!
Go to    and scroll forward to about the 1:40 mark.

It looks like they are building based on Evans & Jackson's original book, so the latest news may not have spread widely there... but it should work fine for their purposes And with internet access plenty of people who get the bug from this will likely look up the latest information and have even more efficient/effective RMH's.