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Count down to Christmas with maths!

Where do the magnetic fields of planets and stars come from?

- In this podcast Paul Shepherd tells us about the maths of football stadiums and why his work required him to listen to Belgian techno.
Amidst all the controversy of the FIFA World Cup 2022 there is also some football to be played. And where there's football, there's maths...

Tosin uses maths to guarantee the continued production of chocolate.

So I was wondering - when someone travels in time to another-then, would they also transport all of their micro-organisms along for the ride? Would their last meal from the other-then still be digesting in their gut, to be deposited in some bathroom within this-then? Would they have disturbed some delicate mass-energy balance equation by bringing along a snack from the other-then to this-then, and by eating it in this-then and convert it into heat-energy cause some backlash yinyang/ karma balancing process to kick-in? Would an entering time-traveller have to displace, say one-Tardis-full unit of 3D space/time/air/mass from its current location to somewhere-else/ somewhen-else? Would the same amount of mass/ energy need to be replaced upon exiting? Could this time-traveling mass-energy mis-matches be the origins of the "dark-energy/ dark-matter" that we are currently detecting in the this-then? Is the overall effect cumulative/ recursive?