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L'Association des professeurs de sciences de l'Ontario
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This Day in Science:

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1989 The The first ring of Neptune is discovered.

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Crucible

Elements
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spark Cloud to Ground Lightning in High Speed
A myriad of stepped leaders work their way towards ground, with one meeting an upward streamer to produce a brilliant return stroke, followed by continuing current. Captured using a high speed camera running at 7200 fps.
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