yes, I have.
'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'
'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'
'You have made another human being happy. There is no greater accomplishment.' -bobbym
That is white on black.
In mathematics, you don't understand things. You just get used to them.
I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.
I have the bug too. What I found out is, if you login at http://mathisfun.com it will redirect you to http://www.mathisfun.com. But at the URL with www. You are not logged in. You are logged in at the root domain. I think this is a bug? Or a feature?
God oppose the proud, but give grace to the humble.