Preface
Human beings have been the masters of the earth since their emergence and prosperity. However, after the publication of Hawking's "A Brief History of Time" in 1998, everything seemed to be different from before. Scientists continued to explore outer space... Ten years have passed. Although scientists have discovered some planets that may have life, they are too far away from the earth. With our current technology, it is impossible to build aircraft to reach there. Moreover, if you encounter powerful aliens, you may not be able to defeat them. By then, will humans still be the masters of the earth?
Among all these impossibilities, one possibility squeezed out...