Related Clues:
- Content in business
- Increasingly dull subject
- Carry weight
- "As a __ of fact ..."
- Be important; substance
- Stuff Mad Hatter had crazily taken out
- Billy Joel "A ___ of Trust"
- Physicist giving name to frequency shift
- Mathematician associated with symbolic logic
- Word that can follow the first parts of 17-, 25-, 42- and 55-Across
- Affair to be of consequence
- Mind over ___
- From which all physical things are made
- Physics stuff
- Stuff that's less shiny?