Andrew Stacey @mathforge.org · Jul 13 This took the combined mental effort of two Oxford graduates and one Cambridge undergraduate to figure out how to remove the base from the rest of the pen. It's designed to be filled with water for painting with watercolours. #mathsky #UKMathsChat #ITeachMaths
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Yes but: The screw threads on these (my spouse uses them) are opposite to those of most devices. I don't know why!
I just lost mine that my one year old very easily took apart, so I would like one of these more difficult ones!
