Input: Read this: In the mid-1950s, Frank Burnet, inspired by a suggestion made by Niels Jerne, formulated the clonal selection theory (CST) of immunity. On the basis of CST, Burnet developed a theory of how an immune response is triggered according to the self/nonself distinction: "self" constituents (constituents of the body) do not trigger destructive immune responses, while "nonself" entities (e.g., pathogens, an allograft) trigger a destructive immune response. The theory was later modified to reflect new discoveries regarding histocompatibility or the complex "two-signal" activation of T cells. The self/nonself theory of immunity and the self/nonself vocabulary have been criticized, but remain very influential.
Question: What property of T cells caused modification of CST?

Output: the complex "two-signal" activation

Input: Read this: Valencia stands on the banks of the Turia River, located on the eastern coast of the Iberian Peninsula and the western part of the Mediterranean Sea, fronting the Gulf of Valencia. At its founding by the Romans, it stood on a river island in the Turia, 6.4 km (4 mi) from the sea. The Albufera, a freshwater lagoon and estuary about 11 km (7 mi) south of the city, is one of the largest lakes in Spain. The City Council bought the lake from the Crown of Spain for 1,072,980 pesetas in 1911, and today it forms the main portion of the Parc Natural de l'Albufera (Albufera Nature Reserve), with a surface area of 21,120 hectares (52,200 acres). In 1986, because of its cultural, historical, and ecological value, the Generalitat Valenciana declared it a natural park.
Question: How far from the sea was Valencia when it was founded?

Output: 6.4 km

Input: Read this: The PlayStation Store is an online virtual market available to users of Sony's PlayStation 3 (PS3) and PlayStation Portable (PSP) game consoles via the PlayStation Network. The Store offers a range of downloadable content both for purchase and available free of charge. Available content includes full games, add-on content, playable demos, themes and game and movie trailers. The service is accessible through an icon on the XMB on PS3 and PSP. The PS3 store can also be accessed on PSP via a Remote Play connection to PS3. The PSP store is also available via the PC application, Media Go. As of September 24, 2009, there have been over 600 million downloads from the PlayStation Store worldwide.
Question: How many unique downloads had there been from the PlayStation Store by late 2009?

Output: over 600 million

Input: Read this: Jonas Bronck (c.160043) was a Swedish born emigrant from Komstad, Norra Ljunga parish in Smaland, Sweden who arrived in New Netherland during the spring of 1639. He became the first recorded European settler in the area now known as the Bronx. He leased land from the Dutch West India Company on the neck of the mainland immediately north of the Dutch settlement in Harlem (on Manhattan island), and bought additional tracts from the local tribes. He eventually accumulated 500 acres (about 2 square km, or 3/4 of a square mile) between the Harlem River and the Aquahung, which became known as Bronck's River, or The Bronx. Dutch and English settlers referred to the area as Bronck's Land. The American poet William Bronk was a descendant of Pieter Bronck, either Jonas Bronck's son or his younger brother.
Question: Where did Bronck emigrate from?

Output:
Smaland, Sweden