Scientists at the time often depended on the royal courts for patronage. But there was considerable variation in the relationships between the courts and scientists in different countries.
Clothing, it seems, can make us colour blind, because whether we perceive someone as' white 'or' black 'depends not just on skin tone - but also how smartly they are dressed, according to researchers.
Like animals that eat a certain plant and that plant relies on a certain fungus to help it get nutrients from soil and on a certain insect for pollination.
In Denmark, the United States, and a few other countries, it is trying to set voluntary standard for models and fashion images there rely more on pear pressure for enforcement.
The tribe is renowned for surviving on the fringe of a salt desert, a harsh and eerie landscape which even the Incas avoided, by flushing the soil with river water.