1) Electric fish 
[scientific term] The sharpness of our senses is defined by the finest detail we can discriminate. Visual acuity is measured by the smallest letters that can be distinguished on a chart and is governed by the anatomical spacing of the mosaic of sensory elements on the retina. Yet spatial distinctions can be made on a finer scale still: misa...
See hyperaesthesia.
See hyperaesthesia.
hyperacuity Increased sharpness of sense perception.