It is not for lack of trying. In some cases, microbiologists have ditched the Petri dish altogether, using microfluidics for manipulating and growing cells. However, these approaches aren’t likely to be adopted at scale as they require less common, less practical, and more expensive devices. So, what about other growth media?
A so-called "planetary nebula" is a confusing misnomer because these clouds have nothing to do with planets. As a medium-size star nears the end, it puffs out into a red giant — about 100 to 1,000 times its original size — eventually engulfing the space around it, including any nearby worlds.
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後來，高先生帶母親去醫院檢查，診斷發現她的脊柱關節移位。醫生解釋，長時間低頭看手機，頸椎和腰椎承受了超出承載能力的壓力。乾眼症、青光眼、頸椎病、肩周炎，這些原本要到八、九十歲才會集中出現的老年病，正在六、七十歲的「低齡老人」身上提前暴發。山東那位因熬夜刷手機導致一側眼睛近視度數飆升至2300度的70歲老太太，不過是這場健康危機中最極端的案例。