Notes
- 1.^ Although evolutionary and developmental constraints preclude the possibility of a wheel as part of an organism, they do not preclude the use of foreign objects as "wheels", either instinctually (as in the case of the dung beetles discussed above), or through intelligently directed tool use (as in human technology).
- 2.^ Wheels can be considered to fall into two types: passive and driven. A passive wheel simply rolls freely over a surface, reducing friction when compared with dragging. A driven wheel is powered, and transmits energy to the surface as a means of generating locomotion.
Read more about this topic: Rolling Animals
Famous quotes containing the word notes:
“The night is itself sleep
And what goes on in it, the naming of the wind,
Our notes to each other, always repeated, always the same.”
—John Ashbery (b. 1927)
“Of all the horrid, hideous notes of woe,
Sadder than owl-songs or the midnight blast,
Is that portentous phrase, “I told you so,”
Uttered by friends, those prophets of the past.”
—George Gordon Noel Byron (1788–1824)
“‘Tis the gift to be simple ‘tis the gift to be free
‘Tis the gift to come down where you ought to be
And when we find ourselves in the place just right
‘Twill be in the valley of love and delight.”
—Unknown. ‘Tis the Gift to Be Simple.
AH. American Hymns Old and New, Vols. I–II. Vol. I, with music; Vol. II, notes on the hymns and biographies of the authors and composers. Albert Christ-Janer, Charles W. Hughes, and Carleton Sprague Smith, eds. (1980)