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Midcoast-area school districts seek to reassure students, families after Texas mass shooting

Brunswick police have increased their presence around that town's schools, while some districts in the southern Midcoast are expanding active shooter protocols and preventative measures. ....

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Briefs - Portland Press Herald

Briefs - Portland Press Herald
pressherald.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from pressherald.com Daily Mail and Mail on Sunday newspapers.

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Under Antarctica's ice, Weddell seals produce ultrasonic vocalizations

Under Antarctica s ice, Weddell seals produce ultrasonic vocalizations
EUGENE, Ore. Dec. 21, 2020 Weddell seals are chirping, whistling and trilling under Antarctica s ice at sound frequencies that are inaudible to humans, according to a research team led by University of Oregon biologists.
Two years of recordings at a live-streaming underwater observatory in McMurdo Sound have captured nine types of tonal ultrasonic seal vocalizations that reach to 50 kilohertz. Humans hear in the sonic range of 20 to 20,000 hertz, or 20 kilohertz.
The discovery is detailed in a paper published online Dec. 18 ahead of print the Journal of the Acoustical Society of America.
Weddell seals (Leptonychotes weddelii), the world s southernmost-ranging mammal, thrive under the continent s sea ice, using their large teeth to create air holes. They can dive to 600 meters in search of prey and remain submerged for 80 minutes. Researchers had first identified 34 seal call types at sonic f ....

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