Aside from the money aspect. Why do we need two different types of

Maslow's Hierarchy of Needs

Why do builders use nails instead of screws? - Quora

How to Explain best news sites to Your Boss by o4lmkbn169 - Issuu

What's the benefit of having different types of screwdrivers and screws which aren't cross-compatible? - Quora

How come screws and bolts don't loosen over time? - Quora

How to Tell the Difference Between Your Wants and Needs

What is Human-Computer Interaction (HCI)?

What is the difference between a hammer or a screw driver? - Quora

Ethics - Wikipedia

Your guide to all 12 zodiac signs: Dates, symbols, compatibility

What does a set screw do? - Quora

Can you explain the differences between the types of bits used in a cordless drill/driver? Which ones are essential to have and which ones are not necessary to purchase? - Quora

Should I use screws with Simpson ties or nails when I'm stud framing? - Quora