Welcome to the fourteenth Daily Field Note! Here you find the top post of the day, one covering each scientific field that is included by Geopolis. Since these authors put a lot of effort in writing a good post they surely deserve the extra exposure.
Geopolis is a project to promote and connect authors who write in the fields of global sciences. Upvotes are currently worth more than $1,50 so don't hesitate to get involved or become a member for higher rewards! You can read more about the project and how to join here:
Subjects curated by Geopolis are Geography, Anthropology, Ecology, Geology and certain branches of History.
Anthropology: What's Behind the Colorful Masks of Carnival?
Carnival... For some people a time to shine, for others a time to not leave the house and avoid embarrassing people. Whatever category you belong to, at least you can learn how the traditional masks came to be thanks to 
Most of the people think that CARNIVAL is all about colorful masks and naked dancing ladies on the streets of Rio de Janeiro. And yeah, that's pretty much true. Today this manifestation is very popular way to have some fun and it is also important touristic attraction. You can see a lot of masked people, you can eat and drink and have some nice time on the street. But, this is just one side of carnival.
Geology: The Earth's System -- Spheres of the earth. The Fantastic four!
Ready for your basic introduction to the different spheres of the earth? 
HOW MANY ECOSYSTEMS IS THE EARTH MADE UP OF?
Sounds like an exam question for high school students... But imagine an interviewer on a million dollar job decided to ask you that. You'd really feel like crap if you couldn't answer correctly.
Hence I sure we'd see the importance of this article, and learn to appreciate our world a bit more.
Today, I want to talk about the Earth as a system, its components, as well as their connectedness to make this circle-circle globe tick.
Geography: Google Earth pearls #12 Miami, living like God... in a swamp
It has been a while since the last post of 
It's so Miami... If you ever have the chance to fly to Miami or just transfer there, look outside your tiny airplane window when flying over this Florida's gem. America's cleanest and richest city might be built on a swamp, with an overall elevation of around 1.5 m, the water is never far away with a astonishing views as a result. As you can see on the second picture, the city has been expanding enormously in the past decades. This expanding, however, happens on saturated and swampy soils. The first problem to tackle when designing a new neighborhood is the excessive water.
History: The Feudal Society in Medieval Europe
History plays such a crucial role in the understanding of current societies. The period of Medieval Europe surely left its mark on many fields so it is really interesting to get to know more about this time period. Luckily 
Although the word 'feudal' was not used to describe a system of traditional obligations in medieval Europe until much later, in the 17th century, the structure was heavily developed in England - starting around the time of its conquest - by William the Conqueror. William almost immediately began erecting permanent defenses, like castles, around the countryside, and needed about 5000 people to man these forts. Nobles were offered incentives – the important commodity of land – instead of money. They in turn agreed to supply armed knights and anything else the king needed. But land grants had already started to come into play during the Carolingian territory expansion of the 8th century - as the heavy cavalry was developed so did the necessity to fund the upkeep of this expensive military service including horses, equipment and retinue. As shown in the Bayeux Tapestry the Normans used heavily armoured mounted cavalry to great advantage against the English, who had the costly disadvantage of being on foot. Raids by the Vikings and the Magyars through Europe had also helped show the need for supporters to be rewarded in return for their much-needed aid.
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