A ten-times increase in the weight-oriented density of batteries would enable so many other moonshots, if we can find a great idea. We just haven't found one yet.
I believe in leavening. You can't have words sticking out too much, like promontories. They disturb the density. You have to flatten them, or raise the surrounding terrain.
In some markets, we don't have a lot of room to expand. We've done studies of store density and essentially found our more dense markets have more than one store per 15,000 people.
The density of settlement of economists over the whole empire of economic science is very uneven, with a few areas of modest size holding the bulk of the population.