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What is 13:30?

What is 13:30?

Answer: 3-D printed headphones

If you guessed military time for 1:30, you’re wrong! 3-D printers are all the rage. Recently, the technology was used to create a pair of functional headphone called 13:30, according to Mashable. The headphones were made in 13 hours and 30 minutes, hence the name 13:30.