High school implementation is growing and requires ongoing exchange of ideas to reach capacity and sustain. (apbs.org)
The website also shows charts that present ongoing exchanges so that you may see how others are trading, and also get an idea about the rates. (rilcoinblog.com)
A few points to note here, based on ongoing exchanges with about 15 cryosphere scientists, some of which took place standing on the shifting floes around the North Pole (I vote for Joe to make a field trip): (dotearth.blogs.nytimes.com)