The US health system: on the brink of major change?

The US system has both considerable strengths and notable weaknesses. It has a large and well-trained health workforce, a wide range of high-quality medical specialists as well as secondary and tertiary institutions, a robust health sector research program, and, for selected services, among the best medical outcomes in the world. But it also suffers from incomplete coverage of its citizenry, health expenditures levels per person far exceeding all other countries, poor objective and subjective indicators of quality and outcomes, and an unequal distribution of resources and outcomes across the country and among different population groups. Because of the adoption of the Affordable Care Act in 2010, and subsequent revisions to it, the US is facing a period of enormous change. There is a great need to improve coverage and improve equity, better ensure quality outcomes, and find ways to better control expenditures.

Almost compact breathers in anharmonic lattices near the continuum limit

Certain strictly anharmonic one-dimensional lattices support discrete breathers over a macroscopic localized domain that in the continuum limit becomes exactly compact. The discrete breather tails decay at a double-exponential rate, so such systems can store energy locally, especially since discrete breathers appear to be stable for amplitudes below a sharp stability threshold. The effective width of other solutions broadens over time, but, under appropriate conditions, only after a positive waiting time. The continuum limit of a planar hexagonal lattice also supports a compact breather.