Some light bulbs tend to emit more blue, some are more yellowish or reddish, but you can't always tell just by looking. I'm particularly interested in finding out how much blue light certain light bulbs I have produce.
It changed so much because there were always European explorers heading out on voyages, for many reasons (like to trade with neighbouring countries, ferrying people from one land to the other, etc). During those voyages they found new lands, and so the maps had to be revised quite often because of these new discoveries.
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The Eastern Mediterranean region is a region that has mostly semi-arid and arid climate, dominated by steppes and deserts. There are no lot of bodies of water and rivers, but the ones that are there are crucial for the survival of the people living there. Since the climate is very harsh and doesn't allow for people to live in larger groups in the mainland, almost all people live around the bodies of water and the rivers. The reason for that is that the bodies of water and the rivers enable the people to produce food, to travel easily, to trade, connect with the rest of the world, and the waters themselves are a big source of food, and of course the most important factor - they provide drinking water.
