The last word about nothing

In a few weeks, the fence of primary school is a place where migrants gather before leaving. The fence is popular due to its temperature and the protection it offers. The sun hits the fence from mid -morning to the end of the afternoon of May, and many years of sunshine have turned what should…

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How does a hot air balloon work?

Hot air balloons work thanks to convection currents. The heat source under the globe heats the air inside. A convection current inside the balloon keeps hot air as the heated air increases, cools and decreases to be heated again. The warm air inside the globe is less dense than the coldest air outside, causing the…

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