Blind dates can be a terrifying thing. Thankfully, the Japanese have created a gadget to help you discover if your date is lying about their age. This gadget emits a sound like the buzzing of a mosquito. You start at the lowest setting and keep moving up. The harder it is for them to hear it the higher their age. That or they’re just naturally half deaf, one of the two. Thank goodness for helpful Japanese gadgets such as this.