Space pen

It was rumored that NASA spent millions of dollars to develop pens capable of writing in space ... while the Soviet Space Agency solved the problem only by using a pencil.
In fact, it was just a rumor, according to NASA historians, NASA astronauts and Soviet astronauts used pencils ... In 1965, NASA applied for 34 mechanical pencils from Houston's Tycam Engineering Manufacturing Inc. 128.89 Dollars per pen.
But pencils were not the best option as their heads were likely to be broken during use and floated in an unexpectedly gravitational position, potentially damaging astronauts or vehicle equipment. On the other hand, the pencils were flammable and that was something NASA avoided after the Apollo fire. 1.
Paul C. Fisher and his company invested $ 1,000,000 to make what is now space pens. It is worth mentioning that NASA did not contribute to this investment until this pen was manufactured. In 1965, Fisher obtained the patent of a pen that could be written upside down in very cold or heat conditions (from -45 to +200 ° C) and under water or other liquids. If the medium in which the pen is used is too hot, the ink will turn From blue to green.
That same year, Fisher presented an anti-gravitational space model (AG-7) to NASA because of the catastrophic failure of the former mechanical pencil. NASA was initially hesitant but after extensive tests on the pen, it decided to use it on its space flight from 1967 ... Then these pens were ordered by the Soviet Union ... A later version of the pen was used.