4
The early modern period
14
Missionaries
The first Christmas in Japan: Xavier was the person who held the first Christmas Mass in Japan. He conducted the Mass in Kagoshima on Christmas Day in 1549, marking the beginning of Christian celebrations in Japan.
15 . 16
Optical Telegraph
Optical telegraphy played a crucial role in military communication. Napoleon Bonaparte used optical telegraphs to quickly transmit military orders, maintaining a strategic advantage. Additionally, various countries' military forces also adopted this technology.
17
Tin Can Telephone
The material of the string used in a string telephone affects how well sound is transmitted. For example, nylon string or wire transmits sound effectively, while softer materials like yarn result in poorer sound transmission.
18
Opera
Opera singers possess astonishing vocal range and technique. For instance, the aria of the "Queen of the Night" in Mozart's opera *The Magic Flute* is renowned for its difficulty, featuring the exceptionally high F6 note.
Typically, the highest note an average untrained woman can sing ranges from C5 ("high C") to E5.
19
Hand Language
There is a course in ICU called "H2: The World of Sign Languages"
