Input: Article: After fans noticed Mercury's increasingly gaunt appearance in 1988, rumours began to spread that Mercury was suffering from AIDS. Mercury flatly denied this, insisting he was merely "exhausted" and too busy to provide interviews. The band decided to continue making albums, starting with The Miracle in 1989 and continuing with Innuendo in 1991. Despite his deteriorating health, the lead singer continued to contribute. For the last two albums made while Mercury was still alive, the band credited all songs to Queen, rather than specific members of the group, freeing them of internal conflict and differences. In 1990, Queen ended their contract with Capitol and signed with Disney's Hollywood Records, which has since remained the group's music catalogue owner in the United States and Canada. That same year, Mercury made his final public appearance when he joined the rest of Queen to collect the Brit Award for Outstanding Contribution to British Music.

Now answer this question: What year was Freddie Mercury's final public appearance with Queen?

Output: 1990

Input: Article: In astronomy, Al-Battani improved the measurements of Hipparchus, preserved in the translation of Ptolemy's Hè Megalè Syntaxis (The great treatise) translated as Almagest. Al-Battani also improved the precision of the measurement of the precession of the Earth's axis. The corrections made to the geocentric model by al-Battani, Ibn al-Haytham, Averroes and the Maragha astronomers such as Nasir al-Din al-Tusi, Mo'ayyeduddin Urdi and Ibn al-Shatir are similar to Copernican heliocentric model. Heliocentric theories may have also been discussed by several other Muslim astronomers such as Ja'far ibn Muhammad Abu Ma'shar al-Balkhi, Abu-Rayhan Biruni, Abu Said al-Sijzi, Qutb al-Din al-Shirazi, and Najm al-Dīn al-Qazwīnī al-Kātibī.

Now answer this question: Which measurement did Al-Battani improve upon?

Output: the Earth's axis

Input: Article: iPods have been criticized for alleged short life-span and fragile hard drives. A 2005 survey conducted on the MacInTouch website found that the iPod line had an average failure rate of 13.7% (although they note that comments from respondents indicate that "the true iPod failure rate may be lower than it appears"). It concluded that some models were more durable than others. In particular, failure rates for iPods employing hard drives was usually above 20% while those with flash memory had a failure rate below 10%. In late 2005, many users complained that the surface of the first generation iPod Nano can become scratched easily, rendering the screen unusable. A class action lawsuit was also filed. Apple initially considered the issue a minor defect, but later began shipping these iPods with protective sleeves.[citation needed]

Now answer this question: What website ran a survey to learn how often iPods ceased working?

Output:
MacInTouch