(Sample link) NASA for middle-school students http://www.nasa.gov/audience/forstudents/5-8/features/index.html
(Sample link) National Geographic for Kids http://www.nationalgeographic.com/kids/
tesselate! http://www.shodor.org/interactivate/activities/tessellate/index.html
Chase e-mail http://www.chase@st-bernadetteelem.com
escher web site http://www.mcescher.com
how to make tetrahedron kites with straws and tissue paper and string http://gw011.k12.sd.us/Tetrahedron%20Kites.htm