It's too bad Galileo Galilei was condemned for all he did. I spent about 25 minutes reading through this site and thought all the information was helpful and enjoyable. The material in this site is accurately presenting he concepts the models that are educationally ignificant. It is serving a great education tool and also it is helpful for us who are learning and to those who are teaching. Lastly, this site is very easy to use and anyone can take advantage of this site for learning purposes.