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Why does earth have weather? – Earth Science

By |2017-08-20T17:40:27+00:00August 20th, 2017|Physics|

A thunderstorm in South Africa The weather on Earth happens because of the evaporation and condensation of water, and because of the spinning of the earth and the tilt of the earth on its axis. Does it seem strange that such quiet things could cause big thunderstorms and huge waves and blizzards? Here's why. Because the Earth is tilted on its axis, [...]

Medieval sailing – Ships in medieval Europe

By |2018-10-04T07:02:49+00:00August 4th, 2017|Medieval, Science|

Caravels, about 1500 AD (Livro das Fortalezas de Duarte Damas) Frame-first ship construction The Early Middle Ages - about 500 AD - brought a major change in Mediterranean ship-building. Instead of putting the planks together to build the outside shell of the ship first, Mediterranean ship-builders began to build the ship's frame first, and then fasten the shell [...]