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- The Elephant in the Room: Why can't Seattle keep a school superintendent?
- Who are we? The garbage police?
- King County's daycare dilemma
- Building and operating small nukes in Tri-Cities gets big backing
- Republicans could gain a better grip on Legislature
- O'Brien, Clark zap Sawant's City Light rate proposal
- On Seattle's waterfront, the sunny days are over
- Parking: Paying more, to circle less
- Seven tips for embracing retirement
- Reading time with Dan Savage
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- The Elephant in the Room: Why can't Seattle keep a school superintendent? (31)
- Republicans could gain a better grip on Legislature (25)
- Who are we? The garbage police? (25)
- How one young couple resolved their own gun debate (50)
- Second Avenue: Just the beginning for protected bike lanes (33)
- A carbon tax would push state's gasoline prices higher (10)
- On Seattle's waterfront, the sunny days are over (12)
- Parking: Paying more, to circle less (8)
- Robert Reich: How to fight for economic fairness in Seattle and beyond (7)
- Photos: Faces from Seattle's climate march (10)
Wed, Dec 12, midnight 2012
Bright paint distinguishes the different components of the SR 99 tunnel boring machine’s cutterhead, and each one serves an important function. The large yellow pieces are fixed cutters that score a groove in the soil as the machine moves forward. As the machine rotates the black disc cutters grind boulders and rocks in the soil. Both of these types of cutters are replaceable and are accessed from within the cutterhead’s arms – when one wears out a new one is put in its place. Learn more about how we’re tunneling toward a new SR 99.