Chemists Celebrate Earth Day. In celebration of Earth Day on April 22, 2009, the American Chemical Society's theme is "AirThe Sky's the Limit". See articles throughout this issue on atmospheric chemistry, environmental chemistry, and green chemistry. The cover features the painting "Cygnus Loop" by Paige Pitt. This acrylic on canvas of a supernova explosion was modelled after a photo taken from the Hubble Space Telescope (NASA). The article by Lynn Diener (a science teacher) and Jordan Acker Anderson (an art teacher) discusses how they collaborated on an assignment to engage art students in a visual conversation about science. Additional works from these students can be seen on pp 153161.
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