The song dynasty which ruled from 960 to 1279 was noted for 2 positive achievements what are they?

Here is what I know:
1. Three of the famous Chinese Four Great Inventions were achieved then, including Gunpowder, Printing Technique and Compass!
2. It's recorded that the international trade was very prosperous then, having trades with more than 50 countries in the world. Also the ship making/building technique was high-rated then.