They have been spurred in part by DNA evidence made available in 1998, which almost certainly proved Thomas Jefferson had fathered at least one child with his slave Sally Hemings.
他们多半是受了 1998 年 DNA 事件的影响。那个事件证明托马斯·杰弗逊至少和他的奴隶萨利·赫明思生过一个孩子。
It has been proved that Low Till Farming increases harvests and reduces water use, and this method reduces the need for chemical products because there are fewer unwanted plants.
For example, in their Science Essentials course, they explain the story of how Barry Marshall proved that peptic ulcers are not the result of stress and spicy foods, but the bacteria H. Pylori.
例如,在科学的本质课上他们解释 Barry Marshall 证明胃溃疡不是压力和辛辣食物引起的,而是感染幽门螺旋杆菌。