(Saturday, April 15, 1972) — U.S. President Richard M. Nixon and Canadian Prime Minister Pierre Elliott Trudeau signed a joint agreement today in Ottawa to begin the large-scale job of cleaning up the Great Lakes, the world’s largest reservoir of fresh water.

(Friday, April 14, 1972, 3 p.m. EST) — U.S. President Richard M. Nixon assured Canada today that the United States wants its northern neighbor to build a national economy free of American domination.

Going before the Canadian Parliament after agreeing in private talks with Prime Minister Pierre Elliot Trudeau to seek a resumption of stalled trade talks, Nixon also aimed oblique criticism at the Soviet Union for supply arms to North Vietnam.

(Thursday, April 13, 1972, 6:30 p.m. EST) — President Richard Nixon, arriving at storm-swept Uplands airport tonight, launched a 40-hour state visit to Ottawa by observing that the United States respects Canada’s separate identity and by suggesting that the two North American peoples must learn and live with their differences.

(Monday, April 13, 1992) — Former U.S. President Ronald Reagan, 81, was jostled but not harmed today when an anti-nuclear protester walked onto a stage in Las Vegas where he was speaking and smashed an honorary crystal statue, hitting him with its shards.