>> 黄金
7. Stephen Hillenburg, who created ‘SpongeBob’, died at the age of 57.
8. Stan Lee explained that he used a false name because he wanted to write a serious and great piece of literature someday. He did not want his link with comic books to be known when that happened.
9. A Chinese scientist claims he successfully created the world's first genetically-edited babies.
解析：确切而言，who created 'SpongeBob' 是非限制性定语从句，起补充说明的作用，去掉也不影响主句的完整性；非限制性的特征之一是从句前有逗号，具体参考前几期文章（← 戳可查看）。
解析：这句话摘自VOA慢速英语，沉住气还是可以辨清其中各类从句的：Stan Lee explained 后面的剩余部分，就是“解释”这个动作的宾语从句；这个从句中，又包含 because 引导的原因状语从句，告诉我们斯坦李用假名的原因。
第二句末，还有个短短的、由 when 引导的时间状语从句。
