However drilling a well is an uncertain activity, with aquifers depleted in some areas.

However, the details of the story are at best uncertain ( see for discussion of the original Wolfgang Sartorius von Waltershausen source and the changes in other versions ); some authors, such as Joseph Rotman in his book A first course in Abstract Algebra, question whether it ever happened.

However the overall proportion of stars with planets is uncertain because not all planets can yet be detected.

However, the fall of the Prodi government a few days after the publication of this article has left the future of Italy-Pacific Islands relations potentially uncertain.

However, his use, or even knowledge, of the Gospel of John is uncertain.

However, the exact date of the poem is uncertain because Coleridge normally dated his poems but did not date Kubla Khan.

However, sceptics argued that the orbits of the comets involved were still too uncertain to produce meaningful results.

However, in the natural world electrons normally remain in an uncertain, non-deterministic, " smeared ", probabilistic wave – particle wavefunction orbital path around ( or through ) the nucleus, defying classical electromagnetism.

However, the wave packet will also spread out as time progresses, which means that the position becomes more uncertain with time.

However, his birth date is still uncertain, as suggestions range from 462 to 512.

However, it appears that some contemporary and later writers, such as the Christian author Lactantius, and Sextus Aurelius Victor ( who wrote about fifty years later and from uncertain sources ), misunderstood the Tetrarchic system in this respect, believing it to have involved a stricter division of territories between the four emperors.

However, after the Tempe debacle, it was uncertain whether the Spartans would be willing to march out from the Peloponnesus again.

However, it is uncertain as to what extent the Convention codifies customary international law.

However, Vega may be much older than this group, so the membership remains uncertain.

However, outward migration rates of around 1. 5 % or more have been experienced for over a decade, therefore actual population changes are uncertain.

However, there is no evidence of the existence of any similar Arab dishes from that period ; though the Arabic mahallabīyah is similar, its origins are uncertain.

However, his rule remained uncertain, varying between idleness and cruel measures as in the case of John of Nepomuk.

However, historical records about its origin remain uncertain.

However, as Voyager only imaged 40 % of Triton's surface, this remains uncertain.

However, the conclusion that Kidinnu is the main creator of System B is uncertain.

However, this classification is somewhat uncertain since we can only infer how our galaxy would appear to an outside observer.

However, this might be seen as merely saying that rigorously proven results are overemphasized, and then " look how chaotic and uncertain the rest of it all is!

However it is uncertain which group of sponges is closest to Eumetazoa, as both calcareous sponges and a subgroup of demosponges called Homoscleromorpha have been nominated by different researchers.

However, it is uncertain exactly when in this period the site was inhabited.

However, their accuracy for the earliest period is uncertain, and a much debated topic among modern historians.

However, this action did not bolster the economy, and construction of the CPR slowed drastically due to lack of funding.

However, construction is canceled five days later, resulting in the Revolt of the Admirals.

However, careful design, testing, construction and use minimizes risks.

However, because its construction was abandoned, it has few inhabitants, and those it has may not all be ( entirely ) real.

However, his construction of the Gothic alphabet is based upon an entirely different modular system.

However, the definition of " Hilbert space " can be broadened to accommodate these states ( see the Gelfand – Naimark – Segal construction or rigged Hilbert spaces ).

However, by 1906, the English Court of Appeal had made it clear in the decision of Automatic Self-Cleansing Filter Syndicate Co v Cunningham 2 Ch 34 that the division of powers between the board and the shareholders in general meaning depended on the construction of the articles of association and that, where the powers of management were vested in the board, the general meeting could not interfere with their lawful exercise.

However, the construction of this project had been blocked by the ruling Communist Party.

However, while Muhammad Ali initiated the construction of public buildings in the city, those reforms had minimal effect on Cairo's landscape.

However, they are vulnerable to over-fishing, mining for construction materials, pollution, and damage caused by tourism.

However, he initiated the construction of two new aqueducts in Rome: the Aqua Claudia and the Anio Novus.

However, Chiang Kai-shek's subordinates refused to take airbase construction seriously until enough capital had been delivered to permit embezzlement on a massive scale.

However, CI's more successful calculators involved a line of construction calculators, which evolved and expanded in the 1990s to present.

However, construction remained focused on putting the biggest possible engines into a small hull, resulting in a somewhat flimsy construction.

However, centuries of efforts failed to find a solution to this problem, until Pierre Wantzel published a proof in 1837 that such a construction was impossible.

However, through careful research relating to paper construction, handwriting development, and the established principles of textual criticism, scholars can be rather certain about where these errors and changes appeared and what the original text probably said.

However, there could still be an even more complex flash-back construction in American films in the case of W. S. Van Dyke ' sThe Lady of the Dugout ( 1918 ).

However, as authors Briar and Hobbs claim, " all the pyramids were robbed " by the New Kingdom, when the construction of royal tombs in a desert valley, now known as the Valley of the Kings, began.

However, World War II delayed car production with efforts shifted to the construction of vehicle bodies, field guns, aircraft and engines.

However, faced with a tide of poverty, Hoover and the Congress approved the Federal Home Loan Bank Act, to spur new home construction and reduce foreclosures.

However, the devaluation of the Ringgit and the deepening recession caused him to create his own programme, based on protecting Malaysia from foreign investors and reinvigorating the economy through construction projects and the lowering of interest rates.

However, comparison with a rocket vehicle using similar construction techniques failed to show much advantage, and funding for the vehicle ceased.

However the growth of the number of cars increasingly outpaces the construction of new roads, resulting in frequently crippling traffic jams in large parts in major cities especially in Jakarta, which often also happen on highways.

However the magnetic properties of the core material cause several side effects which alter the behavior of the inductor and require special construction: