flippingphyiscs.com/algebra.html
is now
flippingphysics.com/ap-physics-1.html
and
flippingphysics.com/calculus.html
is now
flippingphysics.com/ap-physics-c.html
I could bore you with the various reasons for the above changes, however, I do not think it would be overly useful.
And, for the very few of you who link to the anchor points on my webpages, be aware those have changed as well. They are listed near the top of my AP Physics 1 page.
Hope this is helpful for those who need it and not irksome for those who do not!