Transcranial Direct Current Stimulation (TDCS), a deep brain stimulation technique, uses electrodes to direct tiny painless currents across the brain. The currents are thought to improve the firing of neurons and the forming of connections that enable learning. The technique has shown potential in strengthening language skills, math ability, and even memory. A recent Oxford paper, however, argues that the risks of TDCS method must be more carefully considered before the research resumes. Transcranial Direct Current Stimulation joins a group of other promising technologies aimed to enhance cognition, including generic engineering and brain-to-computer interfacing. Some skeptics say these types of techniques are perhaps unfair and go against human nature.