Canadian astronaut David Saint-Jacques has become just the fourth Canadian to take part in a spacewalk and the first in 12 years. Beginning just after 7:30 a.m. EDT, he had four tasks on a list of repairs to perform along with U.S. astronaut Anne McClain on the International Space Station. At the Canadian Space Agency headquarters in suburban Montreal, retired astronaut Dave Williams says Saint-Jacques has done a lot of preparation for this spacewalk.