Open-Source Textbooks a Mixed Bag in California: Scientific American: "As California moves forward with the first open-source digital textbook program in the nation this fall, the best content seems a lot less like Wikipedia and a lot more like traditional publishing.
Bulky, hefty and downright expensive, conventional school textbooks may rank as the most outdated"
Recycled tire Rubber used in playgrounds and sports fields may release
toxic chemicals,
-
Recycled rubber made from used car tires is widely promoted as a
sustainable solution for playground surfaces, sports fields, and running
tracks. Howeve...
6 minutes ago
