Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
A number of technologies allow asphalt/bitumen to be mixed at much lower temperatures. These involve mixing with petroleum solvents to form "cutbacks" with reduced melting point, or mixtures with water to turn the asphalt/bitumen into an emulsion. Asphalt emulsions contain up to 70% asphalt/bitumen and typically less than 1.5% chemical additives. There are two main types of emulsions with different affinity for aggregates, cationic and anionic. Asphalt emulsions are used in a wide variety of applications. Chipseal involves spraying the road surface with asphalt emulsion followed by a layer of crushed rock, gravel or crushed slag. Slurry seal involves the creation of a mixture of asphalt emulsion and fine crushed aggregate that is spread on the surface of a road. Cold-mixed asphalt can also be made from asphalt emulsion to create pavements similar to hot-mixed asphalt, several inches in depth and asphalt emulsions are also blended into recycled hot-mix asphalt to create low-cost pavements.
How many types of chipseals with different affinities are there?
A: unanswerable

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Eritrea (/rtre./ or /rtri/;, officially the State of Eritrea, is a country in East Africa. With its capital at Asmara, it is bordered by Sudan in the west, Ethiopia in the south, and Djibouti in the southeast. The northeastern and eastern parts of Eritrea have an extensive coastline along the Red Sea. The nation has a total area of approximately 117,600 km2 (45,406 sq mi), and includes the Dahlak Archipelago and several of the Hanish Islands. Its name Eritrea is based on the Greek name for the Red Sea ( Erythra Thalassa), which was first adopted for Italian Eritrea in 1890.
What is the name of one of the Hanish Islands?
A: unanswerable

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The nickname cule for a Barcelona supporter is derived from the Catalan cul (English: arse), as the spectators at the first stadium, Camp de la Industria, sat with their culs over the stand. In Spain, about 25% of the population is said to be Barca sympathisers, second behind Real Madrid, supported by 32% of the population. Throughout Europe, Barcelona is the favourite second-choice club. The club's membership figures have seen a significant increase from 100,000 in the 200304 season to 170,000 in September 2009, the sharp rise being attributed to the influence of Ronaldinho and then-president Joan Laporta's media strategy that focused on Spanish and English online media.
What did the club membership grow to by 2009?
A: 170,000

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The risk of reactivation increases with immunosuppression, such as that caused by infection with HIV. In people coinfected with M. tuberculosis and HIV, the risk of reactivation increases to 10% per year. Studies using DNA fingerprinting of M. tuberculosis strains have shown reinfection contributes more substantially to recurrent TB than previously thought, with estimates that it might account for more than 50% of reactivated cases in areas where TB is common. The chance of death from a case of tuberculosis is about 4% as of 2008, down from 8% in 1995.
In what year did the risk of dying from TB reach half what it was in 1995?
A:
2008