input question: The answer to the question: Percussion and rotary drilling were two early methods of what? is inside the article: Ice drilling allows scientists studying glaciers and ice sheets to gain access to what is beneath the ice, to take measurements along the interior of the ice, and to retrieve samples.  Instruments can be placed in the drilled holes to record temperature, pressure, speed, direction of movement, and for other scientific research, such as neutrino detection. Many different methods have been used since 1840, when the first scientific ice drilling expedition attempted to drill through the Unteraargletscher in the Alps.  Two early methods were percussion, in which the ice is fractured and pulverized, and rotary drilling, a method often used in mineral exploration for rock drilling.  In the 1940s, thermal drills began to be used; these drills melt the ice by heating the drill.  Drills that use jets of hot water or steam to bore through ice soon followed.  A growing interest in ice cores, used for palaeoclimatological research, led to ice coring drills being developed in the 1950s and 1960s, and there are now many different coring drills in use.  For obtaining ice cores from deep holes, most investigators use cable-suspended electromechanical drills, which use an armoured cable to carry electrical power to a mechanical drill at the bottom of the borehole. In 1966, a US team successfully drilled through the Greenland ice sheet at Camp Century, at a depth of 1,387 metres (4,551 ft).  Since then many other groups have succeeded in reaching bedrock through the two largest ice sheets, in Greenland and Antarctica.  Recent projects have focused on finding drilling locations that will give scientists access to very old undisturbed ice at the bottom of the borehole, since an undisturbed stratigraphic sequence is required to accurately date the information obtained from the ice., can you guess it ????
output answer: Ice drilling

input question: The answer to the question: Which two islands does the subspecies  R. r. ellenthalerae occur? is inside the article: Two groups of goldcrest taxa are found on the Atlantic islands of Macaronesia. Birds on the Canary Islands are ancient colonists, whereas those on The Azores are of more recent origin. There are no goldcrests on Madeira, where the Madeira firecrest is the only Regulus species.The Canary Islands were colonised in two waves. The first step was the occupation of Tenerife and La Gomera 1.9–2.3 million years ago, followed by a separate invasion of El Hierro and La Palma 1.3–1.8 mya. Birds from the Canary Islands are particularly distinctive having a black forehead, pink-buff underparts and a darker closed wing, and have been sometimes treated either as a subspecies of the common firecrest or as a different Regulus species altogether. They were sometimes called the Tenerife goldcrest, no matter which of the islands they lived on; however, a 2006 study of the vocalisations of these birds indicate that they actually comprise two subspecies of the goldcrest that are separable on voice; R. r. teneriffae occurring on Tenerife and the newly described subspecies, R. r. ellenthalerae, the western Canary Islands goldcrest, occurring on the smaller islands of La Palma and El Hierro.  Tenerife goldcrest R. r. teneriffae (Seebohm, 1883). Found only on Tenerife, Canary Islands; it is a distinctive, small subspecies with a black forehead and pink-buff underparts. Western Canary Islands goldcrest R. r. ellenthalerae (Päckert et al., 2006). Resident on La Palma and El Hierro, Canary Islands.Differences in songs, genetics and morphology suggests that the Azores were colonised in a single invasion in the late Pleistocene, about 100,000 years ago. It is likely that the initial colonisation was of the easternmost islands, with a subsequent spread to the central and western island groups from the western caldera of São Miguel, where both eastern and western song types are found., can you guess it ????
output answer: El Hierro

input question: The answer to the question: What is the full name of the person that played Billy Parker? is inside the article: In 1987, Dylan starred in Richard Marquand's movie Hearts of Fire, in which he played Billy Parker, a washed-up rock star turned chicken farmer whose teenage lover (Fiona) leaves him for a jaded English synth-pop sensation played by Rupert Everett. Dylan also contributed two original songs to the soundtrack—"Night After Night", and "I Had a Dream About You, Baby", as well as a cover of John Hiatt's "The Usual". The film was a critical and commercial flop. Dylan was inducted into the Rock and Roll Hall of Fame in January 1988, with Bruce Springsteen's introduction declaring, "Bob freed your mind the way Elvis freed your body. He showed us that just because music was innately physical did not mean that it was anti-intellectual."The album Down in the Groove in May 1988 sold even more unsuccessfully than his previous studio album. Michael Gray wrote: "The very title undercuts any idea that inspired work may lie within. Here was a further devaluing of the notion of a new Bob Dylan album as something significant." The critical and commercial disappointment of that album was swiftly followed by the success of the Traveling Wilburys. Dylan co-founded the band with George Harrison, Jeff Lynne, Roy Orbison, and Tom Petty, and in late 1988 their multi-platinum Traveling Wilburys Vol. 1 reached three on the US album chart, featuring songs that were described as Dylan's most accessible compositions in years. Despite Orbison's death in December 1988, the remaining four recorded a second album in May 1990 with the title Traveling Wilburys Vol. 3.Dylan finished the decade on a critical high note with Oh Mercy produced by Daniel Lanois. Michael Gray wrote that the album was: "Attentively written, vocally distinctive, musically warm, and uncompromisingly professional, this cohesive whole is the nearest thing to a great Bob Dylan album in the 1980s." The track "Most of the Time", a lost love composition, was later prominently featured in the film High Fidelity, while "What Was It You Wanted?" has been interpreted both as a..., can you guess it ????
output answer:
Bob Dylan