There are fundamental public health problems, like dirty hands instead of a soap habit, that remain killers only because we can't figure out how to change people's habits.
Although solar cells had now penetrated numerous niche markets, the cost of making them still priced them out of the market for grid-connected electricity.
"Whether the volunteers like the flower scent or not didn't matter," Hersh says, "Some reported that they hated the smell, but they still were more likely to buy the shoes in the scented room."
Improvements in road construction and sailing had occurred, but shipping heavy freight over land remained expensive, even with the use of rivers and canals wherever possible.