The total number of human olfactory receptor cells is about 40 million. The human eyeball is about 24.5 mm long. The octopus does not have a blind spot. The total weight of skin in an average adult human is 6 lb.(2.7 kg). There are 1,000 to 10,000 synapses for a typical neuron. The cell bodies of neurons vary in diameter from 4 microns (granule cell) to 100 microns (motor neuron in cord).
The longest word in any of the major English language dictionaries is pneumonoultramicroscopicsilicovolcanoconiosis, a word that refers to a lung disease contracted from the inhalation of very fine silica particles, specifically from a volcano; medically, it is the same as silicosis. Strengths is the longest word in the English language containing only one vowel. 2  Euouae, a medieval musical term, is the longest English word consisting only of vowels, and the word with the most consecutive vowels.
The longest word in any given language depends on the word formation rules of each specific language, and on the types of words allowed for consideration. Agglutinative languages allow for the creation of long words via compounding.