An (sometimes spelled ), or (originally spelled ), is a word with a (a word of the same spelling) that is also an (a word with the opposite meaning). Variant names include , (after ), , , , (Arabic, singular ). It is a word with multiple meanin...
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The or is a mechanism that translates a continuous into an intermittent rotary motion. The rotating drive wheel has a pin that reaches into a slot of the driven wheel advancing it by one step. The drive wheel also has a raised circular blocking d...
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Unique footage of polar bear hunting bearded seal. Clip from the programme 'Polar Bear - Spy on the Ice'. (Mum & baby polar bear in 3D) http://www.youtube.co...
Double pendulum comprising two rigid linkages of negligible mass with point masses attached to the ends of the linkages, confined to two dimensional rotation...