Paving specialist "TARMAC" has come up with a concrete mix that they market as "fast draining", Glowforge the 3D Laser Printer, rapid prototyping with 3D printers, and build your own TWiT Badge.
TWiTBadge Battery Lid TWiTBadge Diffuser TWiTBadge Inner Circle Diffuser TWiTBadge Lid TWiTBadge Enclosure TWiTBadge Logo Hosts: Fr. Robert Ballecer, SJ and Bryan Burnett
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