## Archive for April, 2010

### Nice surprise

Posted by: **Dave Richeson** on April 22, 2010

### Topological maps or topographic maps?

Posted by: **Dave Richeson** on April 20, 2010

### John D. Cook’s daily Twitter tips

Posted by: **Dave Richeson** on April 17, 2010

### Mathematical cousins and collaboration numbers

Posted by: **Dave Richeson** on April 17, 2010

### An Euler line geogebra applet

Posted by: **Dave Richeson** on April 13, 2010

### Everyday geometry: hat size

Posted by: **Dave Richeson** on April 12, 2010