Orlandine stared. Now, if they ever caught her, she would be mind-wiped. Best to make sure that never happened. The subversion program she had sent could destroy itself, but there would be something left: fragments that might easily be identified as a product of Jain technology. She used that same program to locate his back-up power supply—a head-sized U-charger that ran on an allotropic and isotopic liquid pumped through vanadium-silver grids. She inverted his external power supply and fed it all directly into that charger. The trick was to make sure it drew no more than his expected requirement, but that would be enough. Now less than an hour remained before the charger overloaded and his interface sphere became radioactive wreckage.

Time to go.

2

The moment the Needle, testing the first U-space engines ever built, dropped out of realspace during its test flight out from Mars, time-travel ceased to be merely a possibility and became a certainty. The moment the first runcible gates opened it became an uncomfortable reality. Travelling through U-space it is possible to arrive before you leave, or even a thousand years after, yet physically unchanged. And when time travel was tried, it took many months to clear up the wreckage. Don’t let any of those still scared of the realities we face nowadays—those still hanging on desperately to their belief that the universe functions in ways they can easily understand—try to convince you otherwise. Go ask runcible technicians and watch them squirm, query AIs and view the incomprehensible maths. But if we can do it, why aren’t we doing it? We could nip forward and swipe lottery numbers, we could nip back and stop loved ones dying. Yeah, just like quite a few centuries ago we could bring together a couple of plutonium ingots to start a camp fire. Those who understand the maths stare at infinite progressions and exponential factors and know we are just not ready to start throwing around that kind of energy. Time travel is dangerous, cosmic disaster dangerous. Using it for anything less than the aversion of a cosmic disaster equates to using a fusion drive to travel from one side of your house to the other. You’ll certainly arrive, but there probably won’t be anything left of your house when you do.

— From ‘How it Is’ by Gordon