@BBCMarkMardell via Twitter
Daddy can't build a snowman - one survivor's story a year after the Boston bombing http://t.co/Prw6lSc53Y
Former New York City Mayor Michael Bloomberg announces a $50m (£30m) election year push for stricter gun laws across the US.
A 19-year-old Canadian citizen is charged with hacking into the Canada Revenue Agency's website, becoming the first arrest in relation to the Heartbleed security breach.
The human remains found in a car discovered in a drought-parched South Dakota creek last year were two girls who disappeared in 1971, officials say.
A Calgary university mourns the victims killed on Tuesday in a stabbing attack a police chief has called the Canadian city's worst mass murder.
Who was buried behind a boys' school in Florida?
Rancher and armed supporters face off against government
Boston marathon bombing survivors cope with aftermath
Who is running to oust Toronto's embattled, addled mayor?
Moving a dinosaur skeleton across the US
Why are some Americans building mini-homes?
Get a glimpse into the extreme world of warm-weather forest skiing