Some ancient authorities in the doxographic tradition credited the Greek philosophers Pythagoras, in the 6th century BC, and Parmenides, in the 5th, with recognizing that the Earth is spherical.

Some prescription forms use ADD in place of NV with a single box to indicate the additional refractive power to be added to the spherical of each eye.

Some variants can be arranged into a roughly spherical shape, akin to a monkey's fist knot.

Some have tried using hairsprings that are cylindrical or even spherical instead of flat as is prominent today.

Some refer to microspheres or protein protocells as small spherical units postulated by some scientists as a key stage in the origin of life.

Some species septate ; their embryonic shell, which is retained, forms a small, sometimes spherical, chamber.

Some are flexible, while others are rigid.

Some algae may store food in the form of oil droplets. Green algae usually have a rigid cell wall made up of an inner layer of cellulose and outer layer of pectose.

Some have almost no structure or rules, while others have rigid rules of protocol, etiquette, and rank.

Some classical poetry forms, such as Venpa of the Tamil language, had rigid grammars ( to the point that they could be expressed as a context-free grammar ) which ensured a rhythm.

Some classical Tamil poetry forms, such as veṇpā, have rigid grammars for rhyme to the point that they could be expressed as a context-free grammar.

Some linguists have come to actually view the numeral as the head in this relationship to fit the rigid right-branching of these languages.

Some commentators have seen in this era a classical Jungian nightmare cycle, where a rigid culture, unable to contain the demands for greater individual freedom, broke free of the social constraints of the previous age through extreme deviation from the norm.

Some progress has been made using such lightweight, rigid, materials such as Styrofoam, and there have been several flat panel systems commercially produced in recent years.

Some attribute the rigid arms found in most forms of Irish Dancing to the oppressive ruling classes of 18th and 19th century Ireland, either the priests, who banned dancing for being unsavory, or the English landlords who sought to wholly eradicate Irish culture through policies that outlawed Irish games ( Hurling and Irish Football ), Language and Dance.

Some are dismissive, like: Cerimonia (" Ceremony ", all proper manners and rigid, slavish devotion to pointless details ), Coccodrillo ( Italian: " Crocodile ", because he preys on others ), Fanfarone (" Trumpeter " or " Loudmouth "), Giangurgulo (" John the Glutton "), Grillo (" Grasshopper ", because he is small and ' hops ' sides ), Malagamba (" Lame Leg "), Squaquara (" Little Shit "), Papirotonda (" Round Letter ", a complaint signed by mutinous soldiers or sailors in a circle around the main text so the ringleaders or originators cannot be discerned ), Tagliacantoni (" Small-Sized "), and Zerbino ( Italian: " Doormat ").

Some Cryptomonas species may also form immotile resting stages with rigid cell walls ( cysts ) to survive unfavorable conditions.

* Some inflatable boats have a rigid deck and transom which allows an engine to be used for propulsion.

Some guitarists may choose to tap using the sharp edge of their pick instead of fingers to produce a faster, more rigid flurry of notes closer to that of trilling, with a technique known as pick tapping.

Some high-end rigid heat shields are made out of aluminium sheet or other composites, with a ceramic thermal barrier coating to improve the heat insulation.

Some characteristics of language-based patterns are repetitive or rigid language, narrow interests, uneven language development, and poor nonverbal communication.

Some have argued that as a social critic, Lope de Vega attacked, like Cervantes, many of the ancient institutions of his country-aristocracy, chivalry, and rigid morality, among others.

Some low-power reflex klystrons such as the 2K25 and 2K45 had small-diameter rigid coaxial outputs parallel to octal base pins.

Some ( such as wheels with an aerodynamic ring, flat spokes, and fewer spokes than the traditional 32 ) are legal for use in most cycling events, while others such as carbon-fiber tri-spokes ( wheels with only three large, rigid spokes ) generally are only legal in triathlons and time-trials.

Some bastides were not so geometrically planned: " The block geometry of the bastides was not a rigid framework into which a town was squeezed ; it resembles more closely a net, thrown upon the site and adapting to its nuances ," Randolph remarks.

But the multilayered rhythmic-tonal textures heighten the possibilities for improvised interactivity and their “ odd ” character is effective in the sense of the following statement of drummer Elvin Jones: „ Some parts of Latin music are very rigid, as are some aspects of African rhythms.

Some pencil cases have a hard and rigid shell encasing the pens inside while others use a softer material such as plastic, leather or cotton.

Some Pholtans claim that he set the sun and the moon in the sky and maintains them in their rigid procession to show all creatures the One True Way, a strict path which allows no deviation but absolutely assures rightness.

Some middle and upper class persons in Seoul may speak with this accent due to lack of ' rigid ' lingual education policies.

Some of these linguisrts observed that the Syntactic Universals proposed by Chomsky and which required a rigid phrase structure was challenged by the syntax of some of the world's languages that had a much less rigid syntax than that of the languages on which Chomsky had based his studies.

Some examples include pacemakers, infusion pumps, the heart-lung machine, dialysis machines, artificial organs, implants, artificial limbs, corrective lenses, cochlear implants, ocular prosthetics, facial prosthetics, somato prosthetics, and dental implants.

Some cameras make use of multiple lenses and rainbow-colored flashes, or exhibit extreme optical distortions and even light leaks.

Some manufacturers of medium-format 120 film SLR cameras also made leaf-shutter lenses for their focal-plane-shutter models.

Some other crucial contributions were Robert Christy's realization that implosive compression would facilitate nuclear detonation by significantly increasing the density of the plutonium sphere, Luis Alvarez's development of exploding-bridgewire detonators, which ensured that the explosive lenses would all fire simultaneously, and Bruno Rossi's RaLa experiments, which tested ( without plutonium ) various weapon designs to arrive at one that produced an accurately symmetrical implosion.

Some TLR had interchangeable lenses but as these had to be paired lenses they were relatively heavy and did not provide the range of focal lengths that the SLR could support.

Some subluxated lenses may require removal, as in the case of those that float freely or those that have opacified to form cataracts.

Some of these photophores contain lenses, much like those in the eyes of humans, which can intensify or lessen the emanation of light.

Some plastics have a greater index of refraction than most types of glass ; this is useful in the making of corrective lenses shaped to correct various vision abnormalities such as myopia, allowing thinner lenses for a given prescription.

Some sunglasses with interchangeable lenses have optional clear lenses to protect the eyes during low light or night time activities and a colored lens with UV protection for times where sun protection is needed.

Some modern multifocal lenses, such as progressive lenses ( known as " no-line bifocals "), give a smooth transition between these different focal points, unnoticeable by most wearers, while other glasses have lenses specifically intended for use with computer monitors at a fixed distance.

Some toric contact lenses have marks or etchings that can assist the eye doctor in fitting the lens.

Some brands of lenses have markings that make it easier to tell the front of the lens from the back.

Some high performance objective lenses may require matched eyepieces to deliver the best optical performance.

Some have both a focal-plane and a central shutter, allowing fast shutter speeds and the use of barrel lenses with the focal plane shutter and flash synchronization at any speed with the central shutter.

Some fields encourage players to aim away from opponents ' heads during play if possible ; splatter from mask hits can penetrate ventilation holes in the goggles and cause eye irritation, close-range hits to the mask can cause improperly maintained lenses to fail, and hits to unprotected areas of the face, head and neck are especially painful and can cause more serious injury.

Some of these lenses have survived and are now marketed towards use on " APS " digital SLRs for the same reason.

Some lenses have a UV coating to keep out the ultraviolet light that could taint color.

Some cameras even have a manual zoom feature which works by shifting two lenses in front of the shutter.

Some of these models were far more sophisticated and expensive than the Kodak cameras: the Rollei SL26, for instance, featured interchangeable lenses, TTL metering, and a rangefinder, and retailed for $ 300.