Sunday, September 28, 2008 The two major party presidential candidates in the US, Democrat Barack Obama and Republican John McCain, faced each other yesterday in the first TV debate. Despite that McCain had asked to postpone the debate, both were present at the University of Mississippi. The debate, which was moderated by PBS‘ Jim Lehrer, […]
Day: January 6, 2018
Loss of integrity in underground city tunnel causes evacuation of Downtown MontrealLoss of integrity in underground city tunnel causes evacuation of Downtown Montreal
Sunday, August 26, 2007 A one-inch settlement of the roof of The Bay tunnel to the Montreal Metro caused authorities to evacuate 12 blocks of the Montreal downtown core. Several people noticed water infiltration in the tunnel over the last few days. On Friday, August 24, at 1 p.m., while investigating another water infiltration incident, […]
Toothpaste fills cavities without drillingToothpaste fills cavities without drilling
Thursday, February 24, 2005 A paste containing synthetic tooth enamel can seal small cavities without drilling. Kazue Yamagishi and colleagues at the FAP Dental Institute in Tokyo say that the paste can repair small cavities in 15 minutes. Currently, fillers don’t stick to such small cavities so dentists must drill bigger holes. Hydroxyapatite crystals, of […]