1. Man’s bounden duty is to have the courage to explore the truth. ---Copernicus (Poland)

2. I don’t know what people in the world think of me. But I think of it this way: I seem to be a child playing on the sea, sometimes finding a smooth stone, sometimes finding a beautiful shell and being happy about it. Despite this, the ocean of truth mysteriously opens before us. ---Newton (UK)

3. Scientific inspiration can never come by waiting. If there is any accidental opportunity in scientific discovery, then this kind of "accidental opportunity" can only be given to those who are well-educated, to those who are good at independent thinking, and to those who have a perseverance spirit. Not for lazy people. ---Hua Luogeng (China)

4. A scientist should consider the comments of later generations, not the insults or praises at the time. ---Pasteur (France)

5. We are enjoying the huge benefits that other people's inventions have brought to us, and we must also be willing to use our own inventions to serve others. ---Franklin (USA)

6. My philosophy of life is work. I want to reveal the mysteries of nature and benefit mankind. ---Edison (USA)

7. I have never made an accidental invention in my life. All my inventions are the result of careful consideration and rigorous testing.

---Edison (USA)