Upon seeing this part where Xu Yun praised him, Little Niu couldn't help but let out a slightly smug smile at the corner of his mouth.
But soon.
This smile was replaced by seriousness.
Because he saw Xu Yun's reply about his barrel experiment below.
The barrel experiment.
This was a clever composite experiment thought up by Little Niu three years ago (in this timeline), and with it, he created what he considered an incredibly robust concept of absolute space-time.
Little Niu even proudly believed.
The value of this space-time concept might even surpass that of the law of universal gravitation, becoming one of the theoretical cornerstones supporting this world.
But in a subsequent experiment.
Little Niu suddenly discovered a certain situation that directly impacted his understanding.
As the famous inventor of the Newtonian reflecting telescope, Little Niu was also experienced in making mirrors and was a standard DIY enthusiast.
