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Which nut is considered the world’s toughest nut to crack? Answer
The macadamia nut holds the title of the world’s toughest nut to crack due to its remarkably strong shell. This shell requires an immense force of around 300 pounds per square inch to break, a resistance stemming from its dense structure that exhibits mechanical properties similar to aluminum. In fact, the macadamia nutshell is about five times harder than a hazelnut shell, presenting a significant barrier to accessing the creamy kernel within.
This extreme toughness explains why macadamia nuts are rarely sold in their shells; specialized industrial equipment with rollers or blades is needed for efficient processing. In the natural world, only a few creatures, such as the powerful-beaked hyacinth macaw, possess the capability to crack them open. The robust nature of the shell not only protects the nut but also lends itself to various secondary uses, including the production of biochar and durable composite materials.
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