Many moons ago, I was walking around the RAF Museum at Cosford when I was taken aback to see a “special weapon” on display.  I didn’t realize that they had been declassified so, to see an inert one on display was rather a shock.  Now they crop up all over the place.  The Boscombe Down Aviation Collection at Old Sarum has one on display.  It has been cut open to reveal the various elements of what turns a small amount of metal into a large amount of energy!  Amazing to think so much destruction can be done wrought with so little!