Have you ever looked up into the sky on a clear day and seen an airplane flying high in the clouds? If so, you’ve probably also noticed the long white streaks it leaves behind in its path. They are called contrails, and there’s more to these white lines in the sky than meets the eye. The jet fuel that powers the engines of a plane is intensely hot, often burning at more than 500°C. In contrast, the air temperature at high altitudes where commercial flights typically cruise can reach as low as -56°C. When the hot exhaust gases, which include water
A: Apart from K-drama stars Jang Ki-yong, Lee Joon-gi and Lee Je-hoon, who else will hold fan meetings in Taiwan? B: Actor Choi Jin-hyuk will visit in October, followed by actor Jung Hae-in in November. A: I heard that Jung’s visit has caused some controversy. B: Yeah, the tickets for his fan meetings cost up to NT$5,880 and NT$6,880, which led some fans to boycott them. A: The cost of meeting an idol is so high. A: 除了張基龍、李準基、李帝勳外,還有哪些韓星要來台開見面會? B: 崔振赫10月即將訪台,丁海寅11月也將訪台。 A: 聽說丁海寅的見面會還引起一些爭議。 B: 對啊,因為票價高達5,880、6,880,導致不少粉絲抵制。 A: 想見偶像一面的代價還真高! (By Eddy Chang, Taipei Times/台北時報張聖恩)
Jiang Yiwu paced the small room and wondered how the leader of the Literary Society had got here. He could hear the Russian and Manchu police outside. They were looking for him. The Russians controlled the railways now, cutting through China, taking land and resources. The people were angry, and so was he. The revolution was almost ready. But things went wrong. Sun Wu, a key leader, lay in the hospital with critical wounds. The explosives were meant for the revolution but detonated by accident. Sun and the revolutionary plans were discovered by the police. Jiang grimaced at the
Have you ever counted the number of keys on a piano? On a standard modern piano, the number of keys is 88. So, why is this the case? The piano is believed to have been invented around the beginning of the 18th century. It was first created as a modified version of the harpsichord. Most harpsichords at the time had 60 keys—covering five octaves, with each octave comprising seven white keys and five black keys. That’s why the earliest pianos also had 60 keys. The white keys on a piano are called natural keys and correspond to the musical