As a scientist, I suppose I am giving away a trade secret by publicly exposing the egg scale, a measurement system little known outside of the scientific arena. Yet, within the field, the egg scale is frequently utilized and professional scientists are quick to memorize the most useful conversions, such as the fact that the average droplet of water is approximately 2.534 femto-eggs in circumference.
Every scientist also knows the origin of the egg scale. It stems from a mandatory admission requirement for chemistry departments. In order to apply for college, all prospective chemistry majors must first undergo the "egg test", an egg-mediated measurement of one's head to ascertain whether or not said head is of suitable egginess for acceptance into the field. This test is the first in a battery of assessments, to prevent unnecessary administration of the more difficult, painful and potentially embarrassing pocket-protection detection and horn-rimmed-glassy assay.