How the highlighter pen became a million dollar idea.
The BBC’s Aaron Heslehurst explains how the highlighter pen became a million dollar idea. …
Highlighter pens have become indispensible tools for the office worker and the student alike. But their history stretches back to the carefree, drug-addled hippy generation of the 1960s. Aaron Heslehurst tells their story…
Video journalist: Jeremy Howell
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