1) The sport of golf originated in Scotland and is played on courses with 18 holes, each with a designated par score.

2) 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.

3) The strongest natural material known to man is spider silk. It is stronger than steel and more flexible than nylon.

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