Question: The ammunition and shells fired by these weapons are usually fitted with different types of fuses (barometric, time-delay, or proximity) to explode close to the airborne target, releasing a shower of fast metal fragments. For shorter-range work, a lighter weapon with a higher rate of fire is required, to increase a hit probability on a fast airborne target. Weapons between 20 mm and 40 mm caliber have been widely used in this role. Smaller weapons, typically .50 caliber or even 8 mm rifle caliber guns have been used in the smallest mounts.
Is there an answer to this question: What size of weapon calibers are better hitting at short range fast targets?

Answer: between 20 mm and 40 mm caliber

Question: In October 1997, Nintendo released a redesigned model of the SNES (the SNS-101 model) in North America for US$99, which sometimes included the pack-in game Super Mario World 2: Yoshi's Island. Like the earlier redesign of the NES (the NES-101 model), the new model was slimmer and lighter than its predecessor, but it lacked S-Video and RGB output, and it was among the last major SNES-related releases in the region. A similarly redesigned Super Famicom Jr. was released in Japan at around the same time.
Is there an answer to this question: What was missing from the Super Famicom Jr.?

Answer: unanswerable

Question: Tajikistan's economy grew substantially after the war. The GDP of Tajikistan expanded at an average rate of 9.6% over the period of 20002007 according to the World Bank data. This improved Tajikistan's position among other Central Asian countries (namely Turkmenistan and Uzbekistan), which seem to have degraded economically ever since. The primary sources of income in Tajikistan are aluminium production, cotton growing and remittances from migrant workers. Cotton accounts for 60% of agricultural output, supporting 75% of the rural population, and using 45% of irrigated arable land. The aluminium industry is represented by the state-owned Tajik Aluminum Company the biggest aluminium plant in Central Asia and one of the biggest in the world.
Is there an answer to this question: Whose economy declined after the war?

Answer: unanswerable

Question: The apparently sudden appearance of nearly modern flowers in the fossil record initially posed such a problem for the theory of evolution that it was called an "abominable mystery" by Charles Darwin. However, the fossil record has considerably grown since the time of Darwin, and recently discovered angiosperm fossils such as Archaefructus, along with further discoveries of fossil gymnosperms, suggest how angiosperm characteristics may have been acquired in a series of steps. Several groups of extinct gymnosperms, in particular seed ferns, have been proposed as the ancestors of flowering plants, but there is no continuous fossil evidence showing exactly how flowers evolved. Some older fossils, such as the upper Triassic Sanmiguelia, have been suggested. Based on current evidence, some propose that the ancestors of the angiosperms diverged from an unknown group of gymnosperms in the Triassic period (245202 million years ago). Fossil angiosperm-like pollen from the Middle Triassic (247.2242.0 Ma) suggests an older date for their origin. A close relationship between angiosperms and gnetophytes, proposed on the basis of morphological evidence, has more recently been disputed on the basis of molecular evidence that suggest gnetophytes are instead more closely related to other gymnosperms.[citation needed]
Is there an answer to this question: From what period does fossilized pollen suggest an older date for angiosperm origin?

Answer:
Middle Triassic