Sipho loved visiting his grandfather at a small village that brought peace to his busy life with his parents in the city. One Saturday morning while searching through a dusty box, he found a big heavy book with a cover that says " Science Facts  Everyone Should Know" 

Sipho smiled to his grandfather who was seating in front of the television watching one of his old corny TV shows.

"Grandpa look what I found!" Sipho shouted holding the book.

His grandfather paused his tv show and chuckled. " Ah, that's my old science book from when I was your age" said his grandfather while reminiscing about the time he was young. 

Sipho opened the book and pointed at it.

 " Grandpa, it says here that Pluto is the nineth planet in the Milky Way Galaxy but at school, the teacher said Pluto is not a planet anymore so which one is right ?"  Sipho asked while looking confused not knowing which one to believe.

Grandpa smiled at his grandsons curiosity and pulled him closer " When I was a boy, Pluto was the ninth planet but later Scientists found out Pluto was very small compared to other planets so they changed their minds. 

Sipho looked at his grandfather still puzzled and trying to figure out what he is saying.

Sipho frowned still trying to keep up with his grandfather " But I thought science is always right" Sipho said while still having a puzzled look in his face.

His grandfather leaned in closer" Science is clever but it does not know everything at once, it also learns and changes over time just like us" his grandfather said in a gentle voice.

Grandpa realised his grandson was not understanding what his saying so he decided to elaborate more by tapping into his memory.

"Imagine if you thought you knew how to ride a bicycle without practice, do you think you woyld be right?" Grandpa asked while thinking about an incident that happened 2 years ago.

"No, I fell down three times before I got it right"  Sipho said while giggling, reminiscing about his accident when he was still learning how to ride a bicycle.

Sipho smiled because he finally understood his grandfather and decided to turn to another page. "It also says here that dinosaurs were slow and dragged their tails but my school book says dinosaurs could run fast" Sipho said while looking at his grandfather with yet another puzzled look. His grandfather decided to explain more to him. "That's another change that occurred" Said his grandfather while thinking about how his is going to explain this one to his grandson. "As scientist's studies more fossils, they realized dinosaurs were quicker than they once thought" Said grandfather smiling.