from the designer-babies-with-builtin-compasses dept.
sciencehabit writes "For the first time, researchers have isolated magnetic cells in an animal. The cells--found in this case in rainbow trout--may help the fish respond to Earth's magnetic fields, allowing it to find its way home after spending 3 years at sea and traveling up to 300 kilometers away. The advance may help researchers get to the root of magnetic sensing in a variety of creatures, including birds."
We warn the reader in advance that the proof presented here depends on a
clever but highly unmotivated trick.
-- Howard Anton, "Elementary Linear Algebra"