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:
“My notes have a curious tendency, as I realize at last, to annihilate all they purport to record.”
—Samuel Beckett (1906–1989)
“‘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)
“Or bid the soul of Orpheus sing
Such notes as, warbled to the string,
Drew iron tears down Pluto’s cheek,
And made Hell grant what love did seek;”
—John Milton (1608–1674)