The video discusses ten intriguing facts about everyday objects and their purposes. It begins with the story of how the color of car wheels changed from white to black due to a scientific accident, making them five times more resistant and durable [00:06:44.34 - 00:06:46.62].
Next, it explores the purpose of grooves on golf balls, which allow the balls to travel farther [00:06:19.38 - 00:06:22.32]. It then delves into the mystery of the margins in notebooks, which were originally designed to protect books from rodents [00:04:42.35 - 00:04:48.17].
The video continues with the discovery that many coins have small grooves on their edges to prevent counterfeiting [00:05:05.03 - 00:05:33.41]. It also explains that the feed band on car windshields is made from baked ceramic paint to protect the adhesive that joins the windshield to the car body [00:03:50.42 - 00:04:21.95].
The video then reveals that revolving doors in buildings are not just for convenience; they also help maintain the temperature and environment inside the buildings and save energy [00:02:25.58 - 00:02:48.68]. It also explains that the color stripe on toothbrushes indicates the ideal amount of toothpaste to use [00:02:00.02 - 00:02:14.42].
The video reveals that donuts were invented in the 17th century, not by a baker, but by a sailor who accidentally removed the raw dough from a sandwich [00:03:38.31 - 00:03:46.19]. It also explains the purpose of the metal part in staplers, which can be rotated to make it easier to remove temporary staples [00:01:10.04 - 00:01:32.21].
Finally, it discusses the mystery of the hole in lollipop sticks. Many people think it's a whistle, but it's actually a safety feature to prevent the candy from falling off the stick when it's still hot [00:00:21.02 - 00:00:59.81].
1. Daily life becomes monotonous, causing people to lose their curiosity.
2. The purpose of a mysterious hole in a candy lollipop stick is to ensure the candy does not fall off when the lollipop is still hot.
3. The metal part of a stapler can be rotated to make it easier to remove staples.
4. Toothbrushes have color patterns on the bristles that indicate the amount of toothpaste to use.
5. Revolving doors allow for the flow of people in both directions quickly and orderly, and they also maintain the temperature and environment inside buildings.
6. Donuts were first introduced in the 17th century to New York.
7. The feed band on a car's windshield is made from baked ceramic paint and serves to protect the urethane adhesive that joins the windshield to the car body.
8. The margins in notebooks serve to delimit the area in which students must write.
9. Many coins have small grooves on the edges, which were introduced in the 16th century to counteract the practice of carving small portions of the metal into the coins to resell them.
10. Golf balls have grooves to reduce air resistance and allow them to travel further.
11. In 1885, wheels were made black using carbon, which made them five times more resistant and durable than the white ones.