The physical reality is constantly changing, every moment. This is what the Buddha realized by examining himself. With his strong concentrated mind, he penetrated deeply into his own nature and found out that the entire material structure is composed of minute subatomic particles which are continuously arising and vanishing. In the shaping of a finger or the blinking of an eye, he said each one of these particles arises and passes away many of trillion of times.
"Unbelievable," anyone will think who observes only the apparent reality of the body, which seems so solid, so permanent. I used to suppose that the phrase" many trillions of times" might be an idiomatic expression not to be taken literally, however, modern science has confirmed this statement.
Several years ago, an American scientist received the Nobel Prize in physics. For a long time, he had studied and conducted experiments to learn about the subatomic particles of which the physical universe is composed. It was already known that these particles arise and pass away with great rapidity, over and over again. Now this scientist decided to develop an instrument that would be able to count how many times a particle arises and passes away in one second. He very rightly called the instrument that he invented a bubble chamber, and he found out that in one second of subatomic particle arises and vanishes 10^22 times.
The truth that this scientist discovered is the same that which the Buddha found, but what a great difference between them! Like the Buddha, one should also be a scientist of the world within, in order to experience truth directly. realization of truth will automatically change the habit pattern of the mind so that one starts to live according to the truth. Every action becomes directed towards one's own good and the good of others. If this inner experience is missing, science is liable to be misused for destructive ends. But if we become scientists of the reality within we shall proper use of the science for the happiness of all.