By Tim NewcombPosted 04.24.2012 at 10:15 am 7 Comments
Next year, workers will start digging a 1.7-mile tunnel underneath downtown Seattle using the world’s largest tunnel-boring machine. The 57.5-foot-diameter, $80-million drill, which is currently under construction for the State Route 99 project, has about 600 cutting tools—steel bits and spinning disks on the borer’s face that break up dirt and rock. The tools may need to be inspected as often as every 400 feet, or about 20 times over the course of construction.
Scientists must really dread the dentist -- they're always coming up with new solutions to help people avoid that cursed drill. The latest: a hormone gel that regenerates tooth cells in as little as a month.
The gel, the first of its kind, could eliminate the need to fill cavities or drill into the root canal of an infected tooth, Discovery News reports. It is reported in the journal ACS Nano.
From Army choppers to concrete-smashing drills, Popular Science staff tell host Chuck Cage How It Works
By Popular Science StaffPosted 03.27.2009 at 4:00 pm 1 Comment
From the world's tallest mobile crane to NASA's new escape system for the Orion crew capsule, from the meanest drill to the Army's new Blackhawk upgrades, in this episode of Cocktail Party Science, host Chuck Cage sits down with Popular Science's Sr. Associate Editor Seth Fletcher to find out How it Works.
Download the episode here, or subscribe to the iTunes feed.