Scientists unlock the mathematical secret behind narwhals' famously straight tusks

Beneath Arctic waters, the narwhal has long carried a tusk that confounds expectation — straight on the outside, spiraled within, a living paradox that science is only now beginning to decipher. Researchers using X-ray analysis have discovered that the tusk's internal helical structure does not produce a curved form but, through a precise compensatory balance of forces, yields a perfectly straight exterior — evolution solving a geometric problem without conscious design. This finding, arriving as Arctic species face mounting climate pressures, reminds us that nature's most elegant answers are