The study of mathematics is like air or gravity – it’s everywhere, even if you don’t see it.
数学的研究就像空气或重力——它无处不在，即使你看不到它。
The olfactory system is a remarkable example of how the brain can decode complex information from the environment.
这不是钱的问题，而是让事情发生的能力。
"I write for kids because I was a kid who needed books."
