The world's first movable type printing technology for printing paper books was made of porcelain materials
Movable type was never widely used in China because whole-block printing was less expensive, but when movable type reached Europe in the 15th century, it revolutionized the communication of ideas.
It functions as a pointer to "magnetic north", the local magnetic meridian, because the magnetized needle at its heart aligns itself with the horizontal component of the Earth's magnetic field.
compass also helped make bigger discoveries about magnetism and the earth's poles
Song military engineers found gunpowder to be helpful in siege warfare, leading to the development of early types of rockets, cannons, bombs, and mines