A microkernel implements all drivers as user-space programs, and implements core features like IPC in the kernel itself. A monolithic kernel, however, implements the drivers as a part of the kernel...
Fine bone china is more delicate than porcelain, with a warmer, translucent finish. It is typically more expensive than porcelain. Fine china is produced without the inclusion of bone ash from similar materials to porcelain.
Porcelain was first made in China. The Chinese discovered that kaolin clay and petuntse combined made very sturdy pottery. When porcelain was first introduced to Europe, potters experimented with various clays to try to replicate it. Many toilets are made of porcelain.