But it does work. If you open a cafe and want to let people know the cafe is there, sending an ad (either by mail or on Facebook or via Google) to 10,000 people in your zipcode is going to be more effective than sending it to 10,000 random people around the planet.
Agreed. The call is honored by time but not execution.
The story is used to teach the wisdom of evaluating a plan on not only how desirable the outcome would be but also how it can be executed. It provides a moral lesson about the fundamental difference between ideas and their feasibility, and how this affects the value of a given plan.
But they might not be able to reach people who are hidden under the rubble of a collapsed building, for example. Ideally the drones would be built using nanotechnology, allowing them to be so small that they're almost invisible. Of course, coordinating their movements would require quite a powerful AI...
I always saw the hormones that regulate our emotions as primitive forms of memory, older than neurons. So an organism can remain in a certain state for a while.
There is also the possibility that RNA is used for memory:
This article [1] has a section with several references on that, with the most used technique [2] being depicted in fig. 3 (this is from 2016 so there might be a more recent technique around now).
The basic principle is to mix a solution with lipids and one with the mRNA and pump it through a channel with herringbone-shaped incisions that generate turbulence in the fluid. Apparently, the turbulence makes lipids surround the mRNA and stick together to form the nano-particle.
So to quickly summarize they use fluid dynamics and force and whatever sticks through this process will be useful.
I wonder what the rate of lipid-surrounded mRNA is after the process. Say you fire 100 mRNAs through this construct, will 90 of them be surrounded by lipids afterwards? Or 30? Or 100?