Carry a rubber doorstop to wedge from the inside of your room at night.

FORBES: The Realities Women Face When Traveling Alone, And How To Stay Safe

What if it's unsliced, which means it can be cut wafer-thin or doorstop thick?

BBC: NEWS | UK | Magazine | How do I know if I'm eating 6g of salt a day?

But without power these gizmos are about as useful as a doorstop.

FORBES: Spare Batteries

That kind of service-in-perpetuity could become the fate of a long list of technology that many people agree are right now lingering on death's doorstop.

FORBES: Magazine Article

The core of the app is the London Encyclopaedia, an 1, 100-page doorstop first published by Macmillan in 1983, with 5, 500 detailed entries on buildings, places, events and people.

ECONOMIST: A multimedia compendium of 2,000 years

There's a cast iron Boston Terrier doorstop. (A gift from me on her last birthday.) There's even a miniature ceramic Christmas tree enwreathed in Boston Terriers instead of tinsel.

WSJ: At 88, a World Full of Wonders

It just makes a solid doorstop.

FORBES: What $100 Got You In 1954: Lessons In Art And Growth Stocks