Ruhlin spends $3 on business cards and $9 on company letterheads that are made out of solid aluminum and engraved with his contact information. He says it's smart to invest in things that will ...

Bonus: Apple cofounder Steve Wozniak famously told Stephen Colbert that he uses his metal business card to cut steaks on airplanes. Where Big Tech secrets go public — unfiltered in your inbox ...