Author Archives: annettebrennan

About annettebrennan

Learning Architect with Houghton Mifflin Harcourt.

Entrepreneur pitch

Teen Entrepreneurs – 11 Important Business Lessons from Teenage Entrepreneurs

From a student who made bio-fuel and used it to drive a teacher’s car to another who developed a wind-powered cell phone charger, get 11 valuable lessons direct from teenage entrepreneurs who participated in Schoolyard Ventures. This Philadelphia-based organization helps high school students become entrepreneurs.

impossible cube

Escher’s gravity-defying waterfall

M. C. Escher was a Dutch graphic artist specializing in woodcuts, mezzotints, and lithographs inspired by mathematical principles. “Waterfall” is a lithograph first printed in October 1961 creating an optical illusion which Escher was famous for. Select the link in the article to see the original lithograph and more of Escher’s amazing work.