With the active use of simple or colored pencil have to sharpen often, and he is quickly reduced to an uncomfortable size.
However, the stump is still some time will, if inserted in a suitable cap from a ballpoint pen. By the way, inserting a pencil the other side, it can be carried in a pocket without fear of damaging the stylus.
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HOLDER WITH EYELET
Tighten the screw in a tight place you would help an ordinary wire with a eyelet on the end, bent as shown in the figure.
MICROSCOPE FROM A WEBCAM
Talk about making microscope with computer connection with an increase in 300-500 times. This increase is enough for examining the cellular structure of plants, observing the behavior...