... From this project I learned that I can be good at math and science and now I even like them." ... Then Liliana explained it to me again and after I heard it two or three more times it began to make sense. ... In the spring of 2000 we completed our third use of a unit based upon Eratosthenes' measurement of the size, or more accurately, circumference of the Earth. The genesis of this project was when one of us, Paul, attended a workshop on getting scientists involved in K-12 education. ...