1 / 5Everyone has seen many changes from their childhood to adulthood but there are some things that have never changed like the color of tires in trucks and bicycles are always black, most school buses are yellow. Also toilet paper is always white but there are some reasons behind this. let's have look at it.2 / 5The reason for the color of buses being yellow or black is because of security. Even in the dark, yellow can be seen from afar. So in winter when the atmosphere is thick with fog. Even then, this color looks comfortable.3 / 5 If you think of toilet paper, it is white due to bleach. If not, it is brown in color. However, some companies also sell colored toilet paper. But this toilet paper is more expensive than white. 4 / 5Considering the tires of vehicles, the color of the tires is usually black. The reason for this is very interesting. The rubber that tires are sourced from is a milky white color, but carbon black is added to the rubber as a stabilizing chemical compound and makes the tires black.5 / 5Social media platforms like Facebook, Twitter are blue. Blue is associated with feelings of trustworthiness, strength, and dependability. All these factors are highly critical to a social media website. According to various researches, the blue color helps in improving the flow of communication which is important for all social media platforms.