Problem: Incandescent light bulb:

The relationships above are valid for only a few percent change of voltage around rated conditions, but they do indicate that a lamp operated at much lower than rated voltage could last for hundreds of times longer than at rated conditions, albeit with greatly reduced light output. The "Centennial Light" is a light bulb that is accepted by the Guinness Book of World Records as having been burning almost continuously at a fire station in Livermore, California, since 1901. However, the bulb emits the equivalent light of a four watt bulb. A similar story can be told of a 40-watt bulb in Texas that has been illuminated since 21 September 1908. It once resided in an opera house where notable celebrities stopped to take in its glow, and was moved to an area museum in 1977.

What started burning in 1801?
---
A: unanswerable


Problem: Frédéric Chopin:

In April, during the Revolution of 1848 in Paris, he left for London, where he performed at several concerts and at numerous receptions in great houses. This tour was suggested to him by his Scottish pupil Jane Stirling and her elder sister. Stirling also made all the logistical arrangements and provided much of the necessary funding.

Where did Chopin head to during the Revolution of 1848?
---
A: London


Problem: Slavs:

^10 Sub-groups of Slovenes include Prekmurians, Hungarian Slovenes, Carinthian Slovenes, Venetian Slovenes, Resians, and the extinct Carantanians and Somogy Slovenes.

What is a subgroup of Hungarians?
---
A: unanswerable


Problem: Pub:

In 1966 The Blind Beggar in Whitechapel became infamous as the scene of a murder committed by gangster Ronnie Kray. The Ten Bells is associated with several of the victims of Jack the Ripper. In 1955, Ruth Ellis, the last woman executed in the United Kingdom, shot David Blakely as he emerged from The Magdala in South Hill Park, Hampstead, the bullet holes can still be seen in the walls outside. It is said that Vladimir Lenin and a young Joseph Stalin met in the Crown and Anchor pub (now known as The Crown Tavern) on Clerkenwell Green when the latter was visiting London in 1903.

Outside what pub was David Blakely shot?
---
A:
The Magdala