Today's links are all about unexpected applications: Robots star in operas, smartphones deliver marijuana, and screens replace regular textiles on clothing

PSFK editors aggregate top stories from around the web each day.

Do you really need the Apple Watch? Why this gadget is more of a luxury item than a necessity (BGR)

If robots can kill people, we need laws preventing them from doing so on their own (Medium)

The shiny, humanoid, not-so-fat lady sings in this German robot opera (Engadget)

Thanks to one marijuana delivery startup, (medical) weed could be at the touch of your fingertips (Tech Crunch)

An early look at how Apple Music stacks up (Re/code)

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