Because apparently, some people <a href="http://en.wikipedia.org/wiki/Old_age">our age</a> still do not know about the <a href="http://www.frixion-shop.com/">Pilot Frixion Pen</a> ((At the time of writing, <a href="http://www.ebay.de/itm/230792091484?var=530058069992&ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649">this ebay shop</a> is Germany's cheapest option.)), let me just very briefly inform you about this ingenious item. It is a regular <a href="http://cdn.iwastesomuchtime.com/March-15-2012-21-43-56-2934387460s.jpg">ball pen</a>, but the ink it uses turns invisible under a certain amount of heat. Hence, the Frixion has a little rubber nob at the end, which effectively works as an eraser, because rubbing it against a sheet of paper produces enough heat to turn the ink invisible! Good news: Leaving your lecture notes on the heating does not erase them. Seriously though, this pen is just awesome.
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