1) In Chinese mythology, the Dragon Boat Festival (also known as Duanwu Festival) is celebrated to honor Qu Yuan, a poet and statesman of ancient China. It involves dragon boat races, eating sticky rice dumplings (zongzi), and performing rituals to ward off evil spirits and protect against diseases.

2) The speed of light is approximately 299,792,458 meters per second.

3) The blue whale is the largest animal to have ever existed, with an average length of about 82 feet (25 meters).

4) The first car with air conditioning was released in 1939.