After decades of study, scientists sound genuinely optimistic about the possibility of detecting primordial black holes, which might explain dark matter.

You cannot simply mate two arbitary gears that have the same tooth size and pressure angle like you can with helical gears: the gears must be designed in pairs to work together. It is most common to ...

This file provides functions and modules that construct shapes from a list of cross sections. In the case of skin() you specify each cross sectional shape yourself, and the number of points can vary.