Communication of information between neurons is accomplished by movement of chemicals across a small gap called the synapse. Chemicals, called neurotransmitters, are released from one neuron at the presynaptic nerve terminal.
Follow Trail 12 until it runs back into trail 1 and familiar sights and then you are only about 200 yards from the great Cumberland Falls. To the best of my guessing ability I would say this loop was about 8.5 miles long which took us about 3 hours and 45 minutes.
From Fairy Falls to the highway is about 1.1 miles. From the base of Wahkeena Falls, which also offers a fine view up the creek, follow the Return Trail #442 eastward for about half a mile back to the Multnomah Falls parking lot.