The main focus city of the Crusades was Jerusalem. The idea was that it was Christian territory, or at least should be Christian territory, and they always went to reconquer it. The fourth Crusade never made it to Jerusalem because they were busy sacking Constantinople which had a lot of troubles due to constant wars of the Byzantine Empire.
The Cenozoic spans only about 65 million years, The Cenozoic is sometimes called the Age of Mammals, because the largest land animals have been mammals during that time.
The Pyramids used "Load Bearing" for the construction of Egyptian Pyramids.
Community policing arose out of the need to better connect with minority groups following and during the Civil Rights Movement. The movement had shown police to be hostile, violent, and obstructive in the methods. In response to this, police forces deemed it better to work with and learn from the communities instead of using force due to lack of understanding. This program eventually evolved into cultural learning programs in which multicultural education became a priority.
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Space exploration led to advances in many fields. Some include the telecommunications, micro-technology, computer science and the solar power. It started the efforts of lauching space devices and competitive countries were able to send space probes to places like the moon and even Venus.
