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For thousands of years, there have been four basic tastes recognized across cultures. But thanks to Kumiko Ninomiya (a.k.a. the Umami Mama), scientists finally accepted a fifth. So could there be even more?

This is the fourth episode of our six-part series, Making Sense.

For more, go to http://vox.com/unexplainable

It’s a great place to view show transcripts and read more about the topics on our show.

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