In Norse mythology, what unique product design feature was deliberately included in Thor's hammer Mjölnir during its creation that affected its user experience?

In the world where mythology meets modern product marketing, some legendary items have fascinating origin stories that would make today's product managers envious. This trivia explores how the iconic Mjölnir (Thor's hammer) was marketed and launched in Norse mythology - a perfect case study of product design, branding, and consumer perception in ancient storytelling. Test your knowledge about this legendary product launch!

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Its handle was intentionally made too short due to Loki's interference with the manufacturing process
It was designed to change weight based on the worthiness of the user, being light for Thor but immovable for others
It featured an early form of smart technology that allowed it to return to Thor's hand when thrown
It was packaged with a special leather belt and iron gloves as complementary accessories required for safe operation