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Who needs an external battery when you have good old-fashioned emotions? <\/strong><\/p>\n Scientists based out of Nanyang Technological University, Singapore (NTU Singapore) have begun working on augmented reality (AR) contact lenses capable of displaying virtual information in the real world.<\/p>\n But here\u2019s the really interesting part: according to an official release from the university, these high-tech contacts are powered by human tears.<\/p>\n The team has begun development of a flexible battery roughly as thin as the human cornea. This ultra-slim battery is capable of storing electricity when in contact with a saline source, which can be found in tears. According to researchers, this solution can extend battery life up to four hours for every 12-hour cycle. The contacts can also be charged using an external battery.<\/p>\n