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Editor's Note: The following is an excerpt from Mara Hvistendahl's book , Unnatural Selection: Choosing Boys over Girls and the Consequences of a World Full of Men. The technology that ultimately became the dominant method of sex selection around the world began as a tool for navigation. The story of ultrasound dates to 1794, when an Italian biologist curious about how bats find their way in the dark discovered sonar, or the fact that distance can be determined by bouncing sound waves off a faraway object and measuring how long it takes for the waves to ricochet back

With the Allen Telescope Array run by the SETI Institute in northern California, the time is coming when we will encounter an extraterrestrial intelligence (ETI). Contact will probably come sooner rather than later because of Moore’s Law (proposed by Intel’s co-founder Gordon E. Moore), which posits a doubling of computing power every one to two years

The common, renegade approach of sending imperfect tech products out into the world--and having user experience guide improvements--comes under fire. Silicon Valley is renowned for its culture of innovation. There a common, renegade approach is to send products out into the world while they’re still half-baked, in the belief that it’s better to improve them based on real-world use, rather than trying to perfect them behind closed doors