Stacy recently got me a physicist pen:
While to the untrained eye this may look like just another red pen, the uniqueness of the physicist pen can be seen with a close-up of the clip:
You see the little wedge under the clip? If you put the pen in your shirt pocket (as I usually do) but forget to "clicky-clicky" the end to retract the ink tip (or if you loose track of where you are when repetitive noising clicky-clicky clicky-clicky clicky-clicky clicky-clicky) that wedge gets tripped by your shirt and the tip automatically retracts!
Ladies and gentlemen: No need for dorky pocket protectors any more!
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