Problem: Sometime after the publication of the Eclogues (probably before 37 BC), Virgil became part of the circle of Maecenas, Octavian's capable agent d'affaires who sought to counter sympathy for Antony among the leading families by rallying Roman literary figures to Octavian's side. Virgil came to know many of the other leading literary figures of the time, including Horace, in whose poetry he is often mentioned, and Varius Rufus, who later helped finish the Aeneid.
When where the Eclogues likely published?
The answer is the following: before 37 BC

Problem: Delicate sounds and fine overtones were mostly lost, because it took a lot of sound energy to vibrate the recording horn diaphragm and cutting mechanism. There were acoustic limitations due to mechanical resonances in both the recording and playback system. Some pictures of acoustic recording sessions show horns wrapped with tape to help mute these resonances. Even an acoustic recording played back electrically on modern equipment sounds like it was recorded through a horn, notwithstanding a reduction in distortion because of the modern playback. Toward the end of the acoustic era, there were many fine examples of recordings made with horns.
What were issues facing play back and recording mechanics?
The answer is the following: acoustic limitations

Problem: 155th Street is a major crosstown street considered to form the boundary between Harlem and Washington Heights. It is the northernmost of the 155 crosstown streets mapped out in the Commissioner's Plan of 1811 that established the numbered street grid in Manhattan.
155th Street forms the boundary between Harlem and what other neighborhood?
The answer is the following: Washington Heights

Problem: Some predators take advantage of the concentration of birds during migration. Greater noctule bats feed on nocturnal migrating passerines. Some birds of prey specialize on migrating waders.
What do greater noctule bats feed on?
The answer is the following:
nocturnal migrating passerines