![](https://i0.wp.com/farm8.staticflickr.com/7313/9161513536_b3dc361dfe.jpg?w=1170)
Critical Mass damped by heavy water, originally uploaded by spinneyhead.
This has been the wettest day in a while, so Critical Mass was always going
to be less well attended than normal.
This has been the wettest day in a while, so Critical Mass was always going
to be less well attended than normal.