A hysteresis is a kind of phase discontinuity in physics: a substance can in theory loop between two states, but it ends up getting stuck on one side of the loop and never making it back to the other. It's a nice name for the situation in Meglos where the Doctor and Romana end up circling around the same point in time, theoretically able to break back to the mainstream but in practice going back to restart the loop.
I'm fond of Full Circle -- it doesn't have a villian! But that does result in it lacking a little lift. On the other hand, the fanboy in me still cheers at the return of end-of-story cliffhangers... There's also a notable Good Production Value: when the tentacle drags Draith into the lake, he *isn't surreptitiously pushing himself with his leg*.
I think you'll find Season 18 only gets stronger from here. Warrior's Gate, The Keeper of Traken and Logopolis all have flaws but they're all in some way exceptional too.
As wwhyte says, hysteresis is a physical phenomenon - the Wikipedia article also briefly gives an etymology for the word (and interestingly redirects to the same page should you search for the quite logically-inferred "historesis"). It's why you should allow rechargable batteries to run down as far as possible, then let them charge for as long as their design intended.
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I'm fond of Full Circle -- it doesn't have a villian! But that does result in it lacking a little lift. On the other hand, the fanboy in me still cheers at the return of end-of-story cliffhangers... There's also a notable Good Production Value: when the tentacle drags Draith into the lake, he *isn't surreptitiously pushing himself with his leg*.
I think you'll find Season 18 only gets stronger from here. Warrior's Gate, The Keeper of Traken and Logopolis all have flaws but they're all in some way exceptional too.
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I'm two episodes into Warrior's Gate now, and enjoying it so far.
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