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tisti glih
Lives in Mars
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Perspective meets physics.
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How to make an emergency stove.
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The "Miura fold"; a method in which a sheet is folded to minimize storage area while maximizing surface area. This technique is used on the solar panels on satellites.
#wow   #gif  

via http://xeeme.com/BOUCHAC
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Animation showing how Maltese cross in gear mechanism works.

The Geneva drive or Maltese cross is a gear mechanism that translates a continuous rotation 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 disc that locks the driven wheel in position between steps.

http://en.wikipedia.org/wiki/Geneva_drive

#maths   #mathematics   #mechanical  
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tisti glih

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As seen on #Cosmos: Meteors

Shooting stars, or meteors, are bits of interplanetary material falling through Earth's atmosphere and heated to incandescence by friction. These objects are called meteoroids as they are hurtling through space, becoming meteors for the few seconds they streak across the sky and create glowing trails.

Scientists estimate that 44 tonnes (44,000 kilograms, about 48.5 tons) of meteoritic material falls on the Earth each day. Several meteors per hour can usually be seen on any given night. Sometimes the number increases dramatically - these events are termed meteor showers. Some occur annually or at regular intervals as the Earth passes through the trail of dusty debris left by a comet. Meteor showers are usually named after a star or constellation that is close to where the meteors appear in the sky. Perhaps the most famous are the Perseids, which peak around 12 August every year. Every Perseid meteor is a tiny piece of the comet Swift-Tuttle, which swings by the Sun every 135 years. Other meteor showers and their associated comets are the Leonids (Tempel-Tuttle), the Aquarids and Orionids (Halley), and the Taurids (Encke). Most comet dust in meteor showers burns up in the atmosphere before reaching the ground; some dust is captured by high-altitude aircraft and analyzed in NASA laboratories.

Chunks of rock and metal from asteroids and other planetary bodies that survive their journey through the atmosphere and fall to the ground are called meteorites. Most meteorites found on Earth are pebble to fist size, but some are larger than a build-ing. Early Earth experienced many large meteorite impacts that caused extensive destruction.

Image credit: NASA/JPL
#meteor #meteorite #nasa #space


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New this week: TAudioConverter for your audio conversion and CD extraction needs.  It's free so download today!
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https://webmaker.org/en-US/
Učimo spletu
Smo globalna skupnost namenjeni za poučevanje digitalne pismenosti in spletni pismenosti.
Raziskali smo, tinker in ustvarjajo skupaj, da bi zgradili mrežo, ki je odprta in so vsi.
https://webmaker.org/en-US/
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