Today is a great day to learn more about renewable energy, including wind power. It's a great day to teach others about clean, renewable power sources.And it's a day to take political action to encourage our leaders to put more of our tax dollars into green energy production and less of it into fossil fuel subsidies.The U.S. government pays between 10 to 52 billion dollars a year to subsidize fossil fuels! Switching part of that money into wind farms and other sustainable energy projects would be great for the environment and for the security of the nation.
STEM Works is a website that gathers ideas that help kids learn Science, Technology, Engineering and Mathematics; it provides directions for several wind-energy projects.Hereis a video on wind power.The American Wind Energy Association offers several resources for lessons and hands-on activities. Also on this date:
Magna Carta Day
Sculptor Malvina Hoffman's birthday
Valdemar's Day in DenmarkPlan ahead:Check out my Pinterest pages on June holidays, historical anniversaries in June, and June birthdays.And here are my Pinterest pages on July holidays, historical anniversaries in July, and July birthdays.Source:http://every-day-is-special.blogspot.com/2013/06/june-15-global-wind-day.html
June 15 – Global Wind Day Images
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June 15 is Global Wind Day! Let's celebrate! : Page 2 : TreeHugger
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Why are there so many pictures by artist M. C. Escher in Harold Jacob's mathematics textbooks?I personally have seen exactly zero pictures by Rembrandt, Leonardo da Vinci, or Claude Monet in a math textbook—and they were pretty good artists! What makes Escher so popular with math-textbook writers?Escher's work is a great combination of mathematics and art. His art pieces explore mathematical concepts and stretch our minds in the process.When Escher draws knights on horseback, they fit together in tessellations, which is a mathematical pattern that fits shapes together in a process like tiling. 
When he draws a boy looking at a piece of art, in the background of that piece of art...is a boy looking at a piece of art. The strange loops or infinite regressions that Escher created in his art speak about the mathematical concept of infinity. Escher also creates worlds that seem impossible—worlds in which water flows downhill but in a loop, worlds in which gravity pulls every which way, instead of only down, worlds in which ants walk forever along a Mobius strip.Of course, the physics of the universe, it turns out, is stranger than we ever thought possible, so who knows what deep truths these “impossible” pictures hold for us. I will say that the impossible people walking upside-down and topsy-turvy look a lot like astronauts in space!Check out the connection between math and Escher's art here.Zoom in on the infinity of an Escher print here.And enjoy the variety of Escher drawings and woodcuts here.Also on this date:
Stewart's Root Beer Day 
Anniversary of the “discovery” of muskoxen
Bunker Hill DayPlan ahead:Check out my Pinterest pages on June holidays, historical anniversaries in June, and June birthdays.And here are my Pinterest pages on July holidays, historical anniversaries in July, and July birthdays.
