Why do certain clouds appear to be darker than others?

The darker clouds mean it is denser and thicker because it has more water droplets and ice crystals inside it. 

Confucianism paved the way for ancient China through ideals that were focused on your rank being chosen from your intelligence level. These practices are still used today, as we see that many people who are well educated, are considered “well off”, and make a great amount of money.