1、人类书写发展史people write words on different things
on bones 在骨头上
on bamboo slips 在竹简上
on paper 在纸上
on computers 在电脑上
2、颜色和情绪的关系
If you are healthy, you are in the PINK.
If you are sad, you are feeling BLUE.
If you are angry, you are seeing RED.
If you are very very sad, you are in a BLACK mood.