Image showing the ninth drop’s movement between Wednesday 9th April 2014 to Monday 14th April 2014. The gap clearly closed quite rapidly during this period, with the drop descending 2mm in a week, compared to the average of 6cm over the last 13 years -- a 20-fold increase in speed during the ninth drop’s final hours before it collided with the eighth drop. (Image credit: Dr Roy Duncan, UQ)