Some other popular sights are the Waterloo Column, the Laves House, the Wangenheim Palace, the Lower Saxony State Archives, the Hanover Playhouse, the Kropcke Clock, the Anzeiger Tower Block, the Administration Building of the NORD/LB, the Cupola Hall of the Congress Centre, the Lower Saxony Stock, the Ministry of Finance, the Garten Church, the Luther Church, the Gehry Tower (designed by the American architect Frank O. Gehry), the specially designed Bus Stops, the Opera House, the Central Station, the Maschsee lake and the city forest Eilenriede, which is one of the largest of its kind in Europe. With around 40 parks, forests and gardens, a couple of lakes, two rivers and one canal, Hanover offers a large variety of leisure activities.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Which Lake is one of the largest in Europe?
Ah, so.. unanswerable

Greater London's population declined steadily in the decades after the Second World War, from an estimated peak of 8.6 million in 1939 to around 6.8 million in the 1980s. The principal ports for London moved downstream to Felixstowe and Tilbury, with the London Docklands area becoming a focus for regeneration, including the Canary Wharf development. This was borne out of London's ever-increasing role as a major international financial centre during the 1980s. The Thames Barrier was completed in the 1980s to protect London against tidal surges from the North Sea.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): The main ports for London were relocated to where?
Ah, so.. Felixstowe and Tilbury

The Great Irish Famine brought a large influx of Irish immigrants. Over 200,000 were living in New York by 1860, upwards of a quarter of the city's population. There was also extensive immigration from the German provinces, where revolutions had disrupted societies, and Germans comprised another 25% of New York's population by 1860.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): How many immigrants that were Irish were living in New York in 1860?
Ah, so..
Over 200,000