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今日图片
Common crab spider (Xysticus cristatus) female with prey Carniolan honey bee (Apis melifera carnica), a subspecies of the western honey bee. Near Bled, Slovenia.
今日影音
The YouTuber of "How To Make Everything" reconstructs the aeolipile "to see if this very first steam engine could be put to work". "Could the industrial revolution [have] started 2000 years earlier?".
Roman architect and engineer Vitruvius described the aeolipile for an experiment to demonstrate the nature of atmospheric air movements (wind) in his Ten Books on Architecture (30–20 BCE). 参与
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每月照片挑战
拍些照片并上传,参与我们每个月的专题挑战,获得灵感,并尝试新的主题!按此了解本挑战! 亮点
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