How would State-of-the-art aliens attain fast homo sapiens sapiens extinction on Earth, specified their objective not to hinder upcoming sapients evolution on this planet? 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 nineteen fifties or 60s limited story. A Martian disguised as human, attempts to persuade a woman that Earth is in danger from Venusians. https://us.hc6.org/