The amount would getting a Magnetohydrodynamic generator hooked up to my ship's magnetic nozzle affect its exhaust plume? 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 Is there a non-technical gender-neutral time period for child over the age the place somebody is not thought of a kid? t