It has been widely reported in the Canadian media that oil sands company Suncor admitted to a leak of 1, 600 sq m from its Tar Island Pond 1 tailings pond in 1997, although a current spokesman for Suncor says he does not have any information about the incident.

BBC: Canada's 'dirty oil' challenge

The Tar Heels hold the No. 1 overall seed in the NCAA tournament for the first time, and they hope to take their first steps toward a national title this weekend during their four-team regional.

WSJ: No. 1 seed UNC ready to begin NCAA regional

"Ultra low tar" brands claiming to deliver just 0.1 milligram (mg) of nicotine, actually delivered closer to 1 mg.

BBC: Smokers 'puff harder on low tar brands'

The Tar Heels who enter at No. 1 in the RPI should have an easier time getting through the first weekend of the tournament than they did last year, when they were the only top-eight national seed to be knocked out in the regional round.

WSJ: No. 1 seed UNC ready to begin NCAA regional

The eighth-seeded Tar Heels (25-10) take on the winner between Western Kentucky and No. 1 seed Kansas, where Williams coached for 15 years and rang up 418 wins.

NPR: North Carolina Tops Villanova 78-71 In NCAAs