【明報專訊】In the 17th century, the scientist Sir Isaac Newton (牛頓) taught about space, matter, and time. He taught that space, matter, and time are separate from each other. Albert Einstein (愛因斯坦) came along over 200 years later. He disagreed. He said all three are closely related, or relative to each other. They are connected. And they are connected in ways that can be hard to understand.