甚麼是紙? 紙是以植物纖維為原料,經提純、機械分散、成漿、抄造及乾燥成型等工序處理而成。很多人以為紙在東漢時代才出現,然而事實上世界上最早的紙──放馬灘紙在西漢初期就已經出現,這是有文獻和出土實物證明的。 Paper making
Papermaking To make paper you start with plant fiber. This raw material is then treated in a series of processes that include refining, mechanical dispersion, slurrying, shaping, and dehydration. Many people think that paper appeared in the Eastern Han dynasty (25–220), but according to ancient documents and excavated artifacts, the world’s first paper—Fangmatan paper—appeared in the early Western Han (206 BCE–24 CE). Paper making
From the Earliest Rocket to Aerospace Science and Technology Since antiquity, the Chinese have fantasized about roaming the sky. Zhang Hua (232–300) of the Jin dynasty wrote in his Bowu zhi (Notes on a broad array of things) about people from the state of Jigong with one arm and three eyes who could make flying chariots that were capable of roaming the sky. From the Earliest Rocket to Aerospace Science and Technology
火箭是由中國人發明? 中國人自古已有到天上遊走的奇想。晉代張華的《博物志》,文中提到一臂三眼的奇肱人能製作飛車,上天遨遊。可見早在四世紀中國,已有直升陀螺這樣先進的概念。 From the Earliest Rocket to Aerospace Science and Technology
Printing Before the invention of printing in China, there was a long history of copying reading materials by hand. However, hand-copying has obvious disadvantages such as the enormous consumption of time and energy, mis-transcriptions, and missing content. Therefore, there was a pressing need for new technologies to duplicate documents and printing was invented as a result. Printing