Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
For example, consider electronpositron annihilation, in which the rest mass of individual particles is destroyed, but the inertia equivalent of the system of the two particles (its invariant mass) remains (since all energy is associated with mass), and this inertia and invariant mass is carried off by photons which individually are massless, but as a system retain their mass. This is a reversible process the inverse process is called pair creation in which the rest mass of particles is created from energy of two (or more) annihilating photons. In this system the matter (electrons and positrons) is destroyed and changed to non-matter energy (the photons). However, the total system mass and energy do not change during this interaction.
what is created and changed to non-matter energy?
A: unanswerable

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Many Baptist churches choose to affiliate with organizational groups that provide fellowship without control. The largest such group is the Southern Baptist Convention. There also are a substantial number of smaller cooperative groups. Finally, there are Baptist churches that choose to remain autonomous and independent of any denomination, organization, or association. It has been suggested that a primary Baptist principle is that local Baptist Churches are independent and self-governing, and if so the term 'Baptist denomination' may be considered somewhat incongruous.
What is the smallest fellowship without control?
A: unanswerable

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For months each side had been building forward rifle pits and defensive positions, which resulted in many skirmishes. Artillery fire aiming to gain superiority over the enemy guns.:450462 September saw the final assault. On 5 September, another French bombardment (the sixth) was followed by an assault by the French Army on 8 September resulting in the capture of the Malakoff by the French, and following their failure to retake it, the collapse of the Russian defences. Meanwhile, the British captured the Great Redan, just south of the city of Sevastopol. The Russians retreated to the north, blowing up their magazines and the city fell on 9 September 1855 after a 337-day-long siege.:106
What was being built that caused unpremeditated fighting on each side?
A: forward rifle pits and defensive positions

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The oldest known fossil among the Eutheria ("true beasts") is the small shrewlike Juramaia sinensis, or "Jurassic mother from China", dated to 160 million years ago in the Late Jurassic. A later eutherian, Eomaia, dated to 125 million years ago in the Early Cretaceous, possessed some features in common with the marsupials but not with the placentals, evidence that these features were present in the last common ancestor of the two groups but were later lost in the placental lineage. In particular:
What lineage shows some early eutherian features were lost?
A:
unanswerable