Having the pixel buds myself, I feel your pain. Do a little bit of physical activity and at least one side gets loose and slippery.
I found that I simply dont have symmetrical ear canals, I use the mid size plug on one and the smallest plug on the other ear. That way they seem to fit somewhat reliably.
We dont fertilize our agriculture with human waste as is, there are far too many diseases and such to be transmitted. I believe the north koreans are doing this, and are often suffering from parasites and disease transmitted this way.
To use it on the moon they would need bioprocessors first that break down the waste thoroughly