Fingers Do Not Have Muscles
Fingers do not contain muscles (other than arrector pili). The muscles that move the finger joints are in the palm and forearm. The long tendons that deliver motion from the forearm muscles may be observed to move under the skin at the wrist and on the back of the hand.
The Human Nose Can Distinguish Trillion of Odors
Humans can distinguish more than 1 trillion scents, according to new research. The findings show that our sense of smell is far more discriminating than previously thought.