2019 eBird Taxonomy Update

By Birding-Aus, on August 10th, 2019%

see ebird.org/news/2019-ebird-taxonomy-update

Southern Boobook Ninox boobook and Morepork Ninox novaeseelandiae are separated at the species level (formerly known as Southern Boobook Ninox boobook). Southern Boobook is widespread in Australia, New Guinea, Timor, and Indonesia, while Morepork is restricted to Tasmania, New Zealand, and Norfolk Island (a Lord Howe Island subspecies is extinct). We expect more . . . → Read More: 2019 eBird Taxonomy Update

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Is the solution to spherical aberration in optical equipment on the way?

By Birding-Aus, on August 10th, 2019%

It would be nice if it reduced the cost and weight of quality optics

see www.gizmodo.com.au/2019/08/a-mexican-physicist-solved-a-2000-year-old-problem-that-will-lead-to-cheaper-sharper-lenses/

[I would like to see the equation laid out on a single line [even if it were a metre long]

Regards, Laurie

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. . . → Read More: Is the solution to spherical aberration in optical equipment on the way?

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