[jakear]

What about mechanically advancing wax rods? The question isn’t whether the unit price of a super-pen is less than that of a consumer-waxpencil, but rather the R&D cost of the super-pen vs that of a supposed super-waxpencil.

[happymellon]

NASA didn't spend any R&D on it as it was developed by a third party, so that point is moot as the answer is $0.

https://www.scientificamerican.com/article/fact-or-fiction-n...