Physics is really fun when you just get to play around with it.
Here, play with some sand. (java)
Try mixing oil, plant, and water…then set them on fire.

We bought a used DVD from Netflix. Amazing how quickly it arrived in comparison
with something in our normal rental queue. Apparently, the general term for their
slow shipping as a penalty for returning DVDs too fast is “throttling”.
It’s even described
in their terms of use:

In determining priority for shipping and inventory allocation,
we give priority to those members who receive the fewest DVDs
through our service. As a result, those subscribers who receive
the most movies may experience that (i) the shipment of their
next available DVD occurs at least one business day following
return of their previously viewed movie, (ii) delivery takes longer,
as the shipments may not be processed from their local distribution
center and (iii) they receive movies lower in their queue more often
than our other subscribers.

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