How to Do It is Slate's sex advice column. Send it to Stoya and Rich here. My husband and I have an awesome, intelligent 14-year-old son who identifies as bisexual. We are totally accepting and supportive of him. He has had a few short-lived crushes on different genders, though he doesn't seem to be particularly interested in dating right now. His internet search histories are pretty benign--mostly video game stuff, and the occasional search for "hot girls" and "boobs."

It began in early October 2017, when 108 stroke patients with significant arm and hand disabilities turned up for a peculiar clinical trial. The researchers would be surgically implanting a neurostimulator to their vagus nerve, the cranial nerve that runs along the groove in the front of the neck and is responsible for transmitting signals from the brain to other parts of the body. By the time the trial concluded, the subjects' once limited limbs had begun to come back to life. Somehow, pulses to that nerve combined with rehab therapy had given the patients improved use of their disabled limb--and done so faster and more effectively than any treatment before it, even on those who had responded to nothing else. This spring, the findings of the trial were published in The Lancet.

The FBI wants to use artificial intelligence to identify hardened criminals who have obscured their fingerprints by burning or cutting them. For decades this practice has helped offenders escape the law, but now forensic experts hope to create a next-generation system that can't be fooled by the practice. The FBI has issued a request to technology companies across the United States for expert advice to help its Next Generation Identification (NGI) System project. The government agency plans to use artificial intelligence to compensate for the missing portions of the as-yet unreadable fingerprints. The new system will form part of the FBI's massive biometric database.

Winning a competition really can stoke a man's ego – to the extent that they may be more likely to cheat on their partners, a new study suggests. Researchers have found that men experience a testosterone boost when they believe they've bested another man at something, causing some to view themselves as a more valuable'sexual prospect.' And, it all boils down to the belief that they have won, as opposed to the actual effort of the task itself. The study showed that winning causes hormonal fluctuations in men that can influence their sexual behaviour and make them more likely to approach attractive women. Researchers have found that men experience a testosterone boost when they believe they've bested another man at something, causing some to view themselves as a more valuable'sexual prospect.'

Testosterone has long been associated with aggression and competition in men. But the versatile sex hormone can also impact a range of emotional states including empathy, generosity, of corruption, and risk taking. Experts speculate that there may be more to the hormone than first thought, and that testosterone could be just as useful for cooperation as competition. Testosterone has long been associated with aggression and competition in men. It seems that for every question scientists answer on testosterone, more are raised in its place.

Testosterone gets a pretty bad reputation. It's been long known as the hormone of aggression. In his 1998 book, The Trouble With Testosterone: And Other Essays on the Biology of the Human Predicament, the neuroscientist Robert Sapolsky writes, "What evidence links testosterone with aggression? Some pretty obvious stuff": Males tend to have more testosterone than women, and tend to be more aggressive. "Times of life when males are swimming in testosterone (for example, after reaching puberty) correspond to when aggression peaks."