Why Didn’t I Think Of This?

By JO LEE Magazine

When NASA first planned to send up astronauts,

they quickly discovered that ball-point pens

 would not work in zero gravity.

      To combat the problem, NASA scientists spent a decade

and $1.2 billion to develop a pen that writes in zero gravity,

upside down, underwater, on almost any surface including glass,

and at temperatures ranging from below freezing to 300 Celsius.

     Confronted with the same problem, the Israelis used a pencil.

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