The galactic center may hide an unsuspected population of stellar black holes, far denser than expected. A recent study ...

"Basics of the Cylindrical Grinder" provides a comprehensive introduction to different types and components of cylindrical grinding machines and methods such as plunge grinding and traverse grinding.

Instead of lapping the blank by hand, Laurie Hall built this mirror grinding machine from scratch. His site has notes covering his mirror creation machines and other projects.