Input: Read this: High, cold ice clouds such as Cirrus or Cumulonimbus show up bright white, lower warmer clouds such as Stratus or Stratocumulus show up as grey with intermediate clouds shaded accordingly. Hot land surfaces will show up as dark-grey or black. One disadvantage of infrared imagery is that low cloud such as stratus or fog can be a similar temperature to the surrounding land or sea surface and does not show up. However, using the difference in brightness of the IR4 channel (10.311.5 m) and the near-infrared channel (1.581.64 m), low cloud can be distinguished, producing a fog satellite picture. The main advantage of infrared is that images can be produced at night, allowing a continuous sequence of weather to be studied.
Question: What difference allows high clouds to be distinguished?

Output: unanswerable

Input: Read this: Some of his friends provided music at his request; among them, Potocka sang and Franchomme played the cello. Chopin requested that his body be opened after death (for fear of being buried alive) and his heart returned to Warsaw where it rests at the Church of the Holy Cross. He also bequeathed his unfinished notes on a piano tuition method, Projet de methode, to Alkan for completion. On 17 October, after midnight, the physician leaned over him and asked whether he was suffering greatly. "No longer", he replied. He died a few minutes before two o'clock in the morning. Those present at the deathbed appear to have included his sister Ludwika, Princess Marcelina Czartoryska, Sand's daughter Solange, and his close friend Thomas Albrecht. Later that morning, Solange's husband Clesinger made Chopin's death mask and a cast of his left hand.
Question: Who made Chopin's death mask?

Output: Clesinger

Input: Read this: Historically, there has been much dispute over whether such a thing as a vacuum can exist. Ancient Greek philosophers debated the existence of a vacuum, or void, in the context of atomism, which posited void and atom as the fundamental explanatory elements of physics. Following Plato, even the abstract concept of a featureless void faced considerable skepticism: it could not be apprehended by the senses, it could not, itself, provide additional explanatory power beyond the physical volume with which it was commensurate and, by definition, it was quite literally nothing at all, which cannot rightly be said to exist. Aristotle believed that no void could occur naturally, because the denser surrounding material continuum would immediately fill any incipient rarity that might give rise to a void.
Question: What did Greek philosophers believe could not occur naturally?

Output: unanswerable

Input: Read this: Some early male settlers married Indigenous American women and had informal unions with them. Early contact between Indigenous Americans and Europeans was often charged with tension, but also had moments of friendship, cooperation, and intimacy. Marriages took place in both English and Latin colonies between European men and Native women. For instance, on April 5, 1614, Pocahontas, a Powhatan woman in present-day Virginia, married the Englishman John Rolfe of Jamestown. Their son Thomas Rolfe was an ancestor to many descendants in First Families of Virginia. As a result, English laws did not exclude people with some Indigenous American ancestry from being considered English or white.
Question: Who was an ancestor to many First Families of North Carolina?

Output:
unanswerable