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...
Porcelain is made with kaolin clay. Kaolin is white clay that retains its white color when fired. It is fired at temperatures in excess of 1300 C and is more fully vitrified than stoneware. It is usually covered with a clear glaze, which allows the white body to show.
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.