RT @MountainHughes: Physics in action at Tees Barrage. Archimedes screws pumping water up for the run. @Boltonoutdoor @BritishCanoeing http…
RT @MountainHughes: Physics in action at Tees Barrage. Archimedes screws pumping water up for the run. @Boltonoutdoor @BritishCanoeing http…