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  2. Diffraction spike - Wikipedia

    en.wikipedia.org/wiki/Diffraction_spike

    Although diffraction spikes can obscure parts of a photograph and are undesired in professional contexts, some amateur astronomers like the visual effect they give to bright stars – the "Star of Bethlehem" appearance – and even modify their refractors to exhibit the same effect, [5] or to assist with focusing when using a CCD.

  3. Piton - Wikipedia

    en.wikipedia.org/wiki/Piton

    1960s-era pitons, including: knifeblades, lost arrows, bugaboos, ring angles, and bongs. A piton (/ ˈ p iː t ɒ n /; also called pin or peg) in big wall climbing and in aid climbing is a metal spike (usually steel) that is driven into a crack or seam in the climbing surface using a climbing hammer, and which acts as an anchor for protecting the climber from falling or to assist progress in ...

  4. Miyake event - Wikipedia

    en.wikipedia.org/wiki/Miyake_event

    The events are named after the Japanese physicist Fusa Miyake who, as a doctoral student, was the first one to identify these radiocarbon spikes and published the results with co-authors in 2012 in the journal Nature. [15] The investigation at that time found a strong 14 C increase in the annual rings of Japanese cedars for the years 774/775.

  5. Arboreal locomotion - Wikipedia

    en.wikipedia.org/wiki/Arboreal_locomotion

    Animals other than primates that use gripping in climbing include the chameleon, which has mitten-like grasping feet, and many birds that grip branches in perching or moving about. To control descent, especially down large diameter branches, some arboreal animals such as squirrels have evolved highly mobile ankle joints that permit rotating the ...

  6. Blue giant - Wikipedia

    en.wikipedia.org/wiki/Blue_giant

    Because O-type and B-type stars with a giant luminosity classification are often somewhat more luminous than their normal main-sequence counterparts of the same temperatures and because many of these stars are relatively nearby to Earth on the galactic scale of the Milky Way Galaxy, many of the bright stars in the night sky are examples of blue ...

  7. Which Trees Produce Spiky Round Balls? Here's How to ... - AOL

    www.aol.com/news/kind-tree-produces-spiked-round...

    Denny Schrock . Buckeye. Ohio buckeye (Aesculus glabra) is usually a small to medium-size tree (20-40 feet tall) with compound leaves that have five oval-shaped leaflets.Closely related is the ...

  8. Charred by fire, these grand California redwoods rise again ...

    www.aol.com/news/charred-fire-grand-california...

    Tens of thousands of trees were incinerated, and most of the park remains closed, its infrastructure (including 150 campsites) destroyed. Read more: 17 things to do in Santa Cruz, the old-school ...

  9. Arborist - Wikipedia

    en.wikipedia.org/wiki/Arborist

    An arborist using a chainsaw to cut a eucalyptus tree in a public park Two arborists climbing and dismantling a Norway Maple in Ontario, Canada. An arborist, or (less commonly) arboriculturist, is a professional in the practice of arboriculture, which is the cultivation, management, and study of individual trees, shrubs, vines, and other perennial woody plants in dendrology and horticulture.

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