SpaceX has not responded to emailed requests from BBC News for comment. The researchers also sent their findings to the company but did not receive a response.
1. 分解：将数组递归分成两半，直到只剩1个元素
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He said this research would help establish which method was more clinically effective and more cost effective.
There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.