(More generally, how does a soft material carve a hard material?) Obviously it happens, but is it a continual process (every drop of soft water carries away a minute amount of hard material) or is it ...
I'd like to build a simple desk; just a single plank of wood (or a few side-by-side) with solid supports on each end of the desk. What I'm trying to figure out is how thick a plank I want to use for ...
My daughter's coloring book has perforated pages, so you can easily rip out the pages for easier coloring action. Great. Trouble is, the perforation isn't enough, and it's almost impossible to rip ...