4월 2주

arsenic 비소 Arsenic is a true metalloid.

probe 탐침, 엄밀한 조사, 시험, 시도, 탐사용 로켓  The strength of Von Neumann's idea lies in the brute efficiency of exponential growth. Given enough time and patience, a single self-replicating probe could produce millions upon millions of offspring; it would be like a massive bubble expanding outward into the Galaxy. (Seven ways to control the Galaxy with self-replicating probes)