Welcome to the unit. Many scientists have changed our lives and made a difference to the world. Watch the video and finish the following exercises. Scientists have made a great difference to the world in many fields. You on locking is a chinese agricultural scientist and educator known as the father of hybrid rice. He was born in nineteen thirty. He graduated from southwest agricultural college in one hundred fifty three and began his teaching career at an agricultural school in the nineteen sixties. You won devoted himself to the research and development of a Better rice bread. In the nineteen seventies, you are succeeded in developing the first hybrid rice varieties. This hybrid rice species could produce about twenty percent more rice per unit than common rice species. In nineteen seventy nine, the technique for hybrid rice was introduced into the united states. Hybrid rice has been grown in dozens of countries across africa, asia and latin america. You wants efforts to end the hunger problem. Have aren't many awards, such as the wolf Price in agriculture and the world food prize, both in two thousand four. In twenty nineteen, he was awarded the medal of the people's republic of china, one of china's highest donors. Stephen hawking was born in one hundred forty two and died in twenty eighteen. He was an english physicist and author who worked the university of cambridge. Despite his serious illness, he made major contributions to the field of general relativity. One of his scientific achievements was his theoretical prediction that black holes give out, which has since been named hawking radiation after him. Hawking's popular science books have also achieved White success, in which he discusses his theory. In general, a brief history of time was published in one thousand and eighty eight and stayed on the british sunday times, the best seller list for record breaking two hundred and thirty seven weeks. Hawkings contributions to physics aren't many exceptional owners. In two thousand two, he was ranked number twenty five in the bbc's poll of the one hundred greatest britain's.