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In Scratch 2.0, the extensions were all hardware-based and Pen was a normal category. Software-based extensions were added in Scratch 3.0, such as text-to-speech voices, along with some new hardware-based extensions like the micro:bit. The extensions are listed below. An example of the Scratch 3 Extensions Page.
The most important features that Snap! offers, but Scratch does not, include: Expressions using anonymous functions, represented by a block inside a gray ring, having one or more empty slot(s)/argument(s) that are filled by a "higher order function" (the one that is calling the anonymous one).
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Scratch hardness test or scratch test refers to any of a number of methods of measuring scratch hardness. Resistance to abrasion is less affected by surface variations than indentation methods. Scratch hardness is measured with a sclerometer. [1] Attempting to scratch a surface to test a material is a very old technique. [2]
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Scratch wound healing assay experiment of rhabdomyosarcoma, a cancer cell line. A wound healing assay is a laboratory technique used to study cell migration and cell–cell interaction . This is also called a scratch assay because it is done by making a scratch on a cell monolayer and capturing images at regular intervals by time lapse microscope.
In very rare cases, it’s possible for a cat scratch to pass along something more serious than CSD, like rabies, a viral disease that is almost always fatal once symptoms appear. However, it’s ...