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Human history was consequently dominated by two main cycles: the growth cycles of plants and the changing cycles of solar energy (day and night, summer and winter). When sunlight was scarce and when wheat fields were still green, humans had little energy. Granaries were empty, tax collectors were idle, soldiers found it difficult to move and fight, and kings tended to keep the peace. When the sun shone brightly and the wheat ripened, peasants harvested the crops and filled the granaries. Tax collectors hurried to take their share. Soldiers flexed their muscles and sharpened their swords. Kings convened councils and planned their next campaigns. Everyone was fuelled by solar energy – captured and packaged in wheat, rice and potatoes.

Sapiens

Yuval Noah Harari

The fifth time Wang Miao logged on to Three Body, it was dawn as usual, but the world was unrecognizable. The great pyramid that had appeared the first four times had been destroyed by the tri-solar syzygy. In its place was a tall, modern building, whose dark gray shape was familiar to Wang: the United Nations Headquarters. In the distance were many more tall buildings, apparently dehydratories. All had completely reflective mirror surfaces. In the dawn light they appeared as giant crystal plants growing out of the ground. Wang heard a violin playing something by Mozart. The playing wasn’t very practiced, but there was a special charm to it, as though saying: I play for myself. The violinist was a homeless old man sitting on the steps in front of the UN Headquarters, his fluffy silver hair fluttering in the wind. Next to his feet was an old top hat containing some scattered change. Wang suddenly noticed the sun. But it rose in the opposite direction from the dawn light, and the patch of the sky around it was still completely dark. The sun was very large, its half-risen disk taking up a third of the horizon. Wang’s heart beat faster: Such a large sun could only mean another great catastrophe. But when Wang turned around, the old man continued to play as though nothing odd was happening. His silver hair shone brilliantly in the sun, as though it was on fire.

The Three-Body Problem

Cixin Liu and Ken Liu

History is something that very few people have been doing while everyone else was ploughing fields and carrying water buckets.

Sapiens

Yuval Noah Harari

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