- Adult neuroplasticity: Chewing hard food is reportedly enough to trigger measurable skeletal/facial remodeling, although the process takes years.  
- Chinese natalist experiment: Tianmen city offered up to $13 k for a second child and $23 k for a third; births rose 17 % in the first year—one of the largest cash incentives publicly reported.  
- Policy design debate: Participants contrast blanket birth subsidies with a more targeted scheme—pay people who have already demonstrated fertility to relocate to designated “family-center” cities and then subsidize additional children.  
- Hungary’s program was noted as an example that focused incentives on first-time parents, highlighting the range of experimental approaches governments are testing.  
- Data caution: The Tianmen result is a single-year data point amid broader economic migration policies, so causal attribution remains uncertain.