True mind-reading devices remain in the realm of science fiction, and lie detectors rely on indirect cues to catch fibbers. Still, brain scans have allowed neuroscientists to predict what people will do during specific task experiments, and even to observe when a person will make a mistake up to half a minute beforehand. Another technique has used near-infrared light to figure out simple preferences based on brain activity. These feats rely on analyzing brain patterns that occur during specific actions, rather than truly cracking the brain's neural code, but they still have scientists and legal experts debating mind-privacy issues. Perhaps in the near future, they'll just use Twitter for a meeting of minds.