One of these days I'll take vacation enough to read the whole series with all the attention it deserves, and maybe then I'll grok half of it. :) I've been very thorough about basing almost all the Newman tech on what's at least possible, and assuming Leo's power includes "overcome engineering challenges in a given scientific field" (the sole exception is their power supply). Dresden Codak has done its freakin' homework way more than I have, and I've leeched off its ideas from time to time. And other times, we both drink from the same well. A real-life example from 2012: <a href="https://www.sciencemag.org/news/2012/11/wax-filled" rel="nofollow">https://www.sciencemag.org/news/2012/11/wax-filled</a>... Even from that far back, that's pretty good. The current human dead-lift record is about 457 kg. 85 times that is about 40 tons, which is the stated figure for Aria and Summer to lift. Kimiko's quoted at 8 tons in the second link, which makes sense if you build a multi-purpose limb. Leo didn't: his girls are solid muscle and armor, no implant tools or other fanciness. The built-in levitation system drops that a bit, but not much. Similarly, the carbon allotropes I've described really can carry that much strain, and more. Running speed is interesting, because longer legs contribute a lot more than sheer power of muscular contraction. If you can do it, it's better to move in a series of jumps or forward leaps - watch a cheetah in slow motion for example. Summer can't run like a cheetah, but we have Aria jumping grasshopper-style to move quickly, and she could probably hit 100 km/h or better in doing so. And of course, "technology is shaped by philosophy and vice versa, it's all connected" has been my entire god damn character.