Trackballs were occasionally used in e-sports prior to the mainstreaming of optical mice in the early 2000s because they were more reliable than ball mice, but now they are extremely rare because optical mice offer superior speed and precision.

* 120 ° parhelion, relatively rare halo, an optical phenomenon occasionally appearing along with very bright sun dogs

* Infralateral arc, a rare halo, an optical phenomenon appearing similar to a rainbow under a white parhelic circle

* Parry arc, a rare halo, an optical phenomenon which occasionally appears over a 22 ° halo together with an upper tangent arc

* Supralateral arc, a rare halo, an optical phenomenon often confused with the indeed infrequently appearing 46 ° halo

Throughout its history, Leitz has been responsible for numerous optical innovations, such as aspherical production lenses, multicoated lenses, and rare earth lenses.

The RCT offers good off-axis optical performance, but examples are relatively rare due to the high cost of hyperbolic primary mirror fabrication ; Ritchey – Chrétien configurations are most commonly found on high-performance professional telescopes.

On November 13, 2010, Ikeya discovered the P / 2010 V1 ( Ikeya-Murakami ) comet using an optical telescope, rare in an era with access to digital imaging technologies.

Meanwhile he worked as cameraman and assistant editor on other peoples films, notably To Hear Your Banjo Play ( 1941 ), filming a folk music festival atop a mountain in south Virginia where there was no electricity, with a 35mm studio camera and 35mm optical film sound recorder using batteries in a large truck, a rare achievement at that time.

Available in the purest Type IIa colorless and rare fancy yellow colors, the company's diamonds have the same cut, color and clarity, as well as identical chemical, optical and physical characteristics as the highest-quality mined diamonds.

DLPS oversees the scanning and optical character recognition of about 5, 000 texts per year, many of them rare, brittle, or delicate.

Fiberoptic amplifiers are based on optical fibers doped with rare earths.

* The plural of Anthelion, a rare optical phenomenon

An anthelion ( plural anthelia, from late Greek ανθηλιος, " opposite the sun ") is a rare optical phenomenon appearing on the parhelic circle opposite to the sun as a faint white halo, not unlike a sundog.

The once rare phenomenon of having a country hit cross over to pop success became more common.

The formation of geysers is due to particular hydrogeological conditions, which exist in only a few places on Earth, so they are a fairly rare phenomenon.

A rare meteorological phenomenon encountered during winter is ice fog, which comprises ice crystals suspended in the air ; it occurs only at very low temperatures, below − 30 ° C (− 22 ° F ).

While they do not sing or call out like males do, they do answer back ( an extremely rare phenomenon in the animal world ).

This administration was in turn opposed by the Polish Underground State, which not only fielded one of the three largest partisan forces in existence, but was a rare example of an underground government, a phenomenon not witnessed in many other occupied countries.

On the first Sunday of November 1941, high school students from all over Corfu took part in student protests against the occupying Italian army ; these student protests of the island were among the first acts of overt popular Resistance in occupied Greece and a rare phenomenon even by wartime European standards.

Hofstadter later recognized ( what he saw as ) the influence of Darwinist and other evolutionary ideas upon those with collectivist views, enough to devise a term for the phenomenon, “ Darwinist collectivism .” Before Hofstadter's work the use of the term in English academic journals was quite rare.

Their common basic hypothesis was that the phenomenon was induced from rare oxidation processes and radical reactions.

" If ( she ) had reacted differently, that would have been suspect " and Hearst was " a rare phenomenon ( in a first world nation )... the first and as far as I know the only victim of a political kidnapping in the United States " were direct quotes from Hearst's autobiography attributed to the doctor.

( Other prominent Mediterranean tenors of the late 19th century to early 20th century who, like Caruso, did not " bleat " were Angelo Masini, Francesco Tamagno, Francesco Marconi, Francisco Viñas, Emilio De Marchi, Giuseppe Borgatti and Giovanni Zenatello, while the phenomenon was rare among French, German, Russian and Anglo-Saxon tenors of the same period — see Scott.

This has been noted as a rare phenomenon in many plants ( e. g. Nicotiana and Crepis ), and occurs as the regular reproductive method in the Saharan Cypress, Cupressus dupreziana.

Such is a rare phenomenon because interstates and US routes are numbered in order from opposite ends of the country, and in middle sections, such overlap is avoided.

A rare phenomenon, the occurrence is estimated to range from 1 in 50, 000 births to 1 in 100, 000 births, with a somewhat higher incidence in Southwest Asia and Africa.

Although serfdom became increasingly rare in most of Western Europe after the Renaissance, it grew strong in Central and Eastern Europe, where it had previously been less common ( this phenomenon was known as " later serfdom ").

For example, in " The Waking Dream: Unlocking the Symbolic Language of Our Lives ", Ray Grasse suggests that instead of being a " rare " phenomenon, as Jung suggested, synchronicity is more likely all-pervasive, and that the occasional dramatic coincidence is only the tip of a larger iceberg of meaning that underlies our lives.

Years of average rainfall are rare ; the usual pattern is bimodal, with some large string of dry years usually related to La Niña phenomenon ( slightly higher than 11. 5 inches / 300 millimetres ) followed by other years ( around 5 ) related to El Niño that make up the average ( with higher than 39 inches / 1000 millimetres ).

This fairly rare phenomenon, a heat burst, also tends to be of exceedingly dry air.

* Transient lunar phenomenon, rare illumination event on the Lunar surface.

Until recently, research on this phenomenon has been relatively rare, with only two types of involuntary memory retrieval identified: involuntary autobiographical memory retrieval, and involuntary semantic memory retrieval.

Artists were so highly valued under his rule that they were paid for their work — a rare phenomenon in ancient civilizations.

In rare cases, diseases such as encephalitis or a pituitary tumor may damage the appestat permanently, destroying nearly all sense of satiety.

An example is modern Greek which may write the phoneme in six different ways: ⟨ ι ⟩, ⟨ η ⟩, ⟨ υ ⟩, ⟨ ει ⟩, ⟨ οι ⟩, and ⟨ υι ⟩ ( although the last is rare ).

In rare cases a linguist may represent phonemes with abstract symbols, such as dingbats, so as not to privilege any one allophone.

In rare cases such as Chediak Higashi Syndrome, albinism may be associated with deficiencies in the transportation of melanin granules.

The rare case risks are extremely high because these small price differences are converted to large profits via leverage ( borrowed money ), and in the rare event of a large price move, this may yield a large loss.

The leaves are alternate ( rarely opposite ), sometimes organized in basal rosettes ; in rare shrubby crucifers of Mediterranean their leaves are mostly in terminal rosettes, and may be coriaceous and evergreen.

In more recent years, pure steals of home are rare, although a player may steal home plate during a " delayed double steal ," in which a runner on first attempts to steal second, while the runner on third breaks for home as soon as the catcher throws to second base.

A batter may or may not be charged with a plate appearance ( and possibly at-bat ) in the rare instance when he is replaced by a pinch hitter after having already started his turn at bat.

The advisory committee then selects the judging panel, the membership of which changes each year, although on rare occasions a judge may be selected a second time.

Within the prevailing Standard Model of particle physics, the number of baryons may change in multiples of three due to the action of sphalerons, although this is rare and has not been observed under experiment.

This may exemplify a rare example of insular dwarfing in a mainland context, with the " islands " being formed by the extensive river networks in the Amazon Basin, which form effective biogeographic barriers.

Parasites may be introduced through salad, meat that is uncooked or done rare, and unboiled water.

( These rules are not intended to apply in case of differing episodes of the same series ; this difference may not always be communicated to distributors, although this is rather rare.

It needs to be mentioned also that two substituents on an atom may, in rare cases, be geometrical isomers.

Less common side-effects may include cardiac arrhythmias, blurry or double vision and / or the temporary loss of blood cells or platelets and in rare cases can cause aplastic anemia.

With normal use, small reductions in white cell count and serum sodium are common ; however, in rare cases, the loss of platelets may become life-threatening.

Among the rare states profitable at decolonization was India, to which scholars credibly argue that Uganda, Malaysia and Angola may be included.

Trance is the ability to communicate with, and mainly to receive from, other entities, incarnate and discarnate, and may sometimes be independent of time ; it is usually divided into deep trance ( obliterative and so dangerous, where the operative abdicates the throne, quite common ) and light trance ( a high or even total degree of awareness and thus safer for the practitioner, and extremely rare when well-done ).

The blood type is generally not stamped on the dog tags as it may change ( rare ) and that, in combat situations, they give standard blood ( type 0 ) and, in hospitals, it is easier to check the blood than the tag.

PCP may be underestimated in Africa: since machinery " required for accurate testing is relatively rare in many resource-poor areas, including large parts of Africa, PCP is likely to be underdiagnosed in Africa.

Under exceptional circumstances, a redive may be granted, but these are exceedingly rare ( usually for very young divers just learning how to compete, or if some event outside the diver's control has caused them to be unable to perform ).

She described this condition in 1978 Estimates of the prevalence of this rare disorder have ranged from 1: 20, 000 to 1: 40, 000 births, though the incidence may be found to be greater as the syndrome becomes better recognized and new genetic evidence is discovered.

Furigana may also be necessary in the rare case where names are transliterated into kanji from other languages ( e. g. soccer star Ruy Ramos and politician Marutei Tsurunen.