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2. Tunnelling companies of the Royal Engineers - Wikipedia

   en.wikipedia.org/wiki/Tunnelling_companies_of...

   Example of a mine gallery with timber roof support. In siege warfare, tunnelling is a long-held tactic for breaching and breaking enemy defences.The Greek historian Polybius, in his Histories, described accounts of mining during Philip V of Macedon's siege of the town of Prinassos; there is also a graphic account of mining and counter-mining at the Roman siege of Ambracia.

3. Subwoofer - Wikipedia

   en.wikipedia.org/wiki/Subwoofer

   From about 1900 to the 1950s, the "lowest frequency in practical use" in recordings, broadcasting and music playback was 100 Hz. [9] When sound was developed for motion pictures, the basic RCA sound system was a single 8-inch (20 cm) speaker mounted in straight horn, an approach which was deemed unsatisfactory by Hollywood decisionmakers, who hired Western Electric engineers to develop a ...

4. British U-class submarine - Wikipedia

   en.wikipedia.org/wiki/British_U-class_submarine

   The boats had a fuel capacity of 38 long tons (39 t) giving a range of 3,800 nmi (7,000 km; 4,400 mi) at 10 kn (19 km/h; 12 mph) on the surface and 120 nmi (220 km; 140 mi) at 2 kn (3.7 km/h; 2.3 mph) submerged; battery recharging required the submarine to surface; in 1944 dummy snorkels were fitted to some boats for anti-submarine warfare ...

5. Woofer - Wikipedia

   en.wikipedia.org/wiki/Woofer

   A woofer or bass speaker is a technical term for a loudspeaker driver designed to produce low frequency sounds, typically from 20 Hz up to a few hundred Hz. The name is from the onomatopoeic English word for a dog's deep bark, "woof" [1] (in contrast to a tweeter, the name used for loudspeakers designed to reproduce high-frequency sounds, deriving from the shrill calls of birds, "tweets").

6. Stellantis CEO Carlos Tavares steps down as carmaker ... - AOL

   www.aol.com/stellantis-ceo-carlos-tavares...

   Stellantis CEO Carlos Tavares is stepping down after nearly four years in the top spot of the automaker, which owns car brands like Jeep, Citroën and Ram, amid an ongoing struggle with slumping ...

7. Richard Allen given maximum sentence in killings of Liberty ...

   www.aol.com/news/richard-allen-given-maximum...

   Richard Allen was sentenced to the maximum 130 years for the murders. in Delphi, Ind., of Abigail "Abby" Williams,13, and Liberty "Libby" German, 14.