For example, recycling is difficult to incentivize because people who don't recycle still benefit when others recycle, but recycling as a whole ... ... <看更多>

This video shows how to compute the modal participation factor and the modal mass participation ratio manually using mode shapes obtained ... ... <看更多>

that grass roots sports should also be included. I believe there are many parallels between, for example, tens of thousands of runners in an event and tens of ... ... <看更多>