Ÿ On May 13, 1958, Vice President Richard Nixon’s car was attacked and nearly overturned by an angry crowd shouting anti-American slogans as Nixon traveled through Caracas, Venezuela, during a goodwill trip through Latin America. None of the car’s passengers were injured and the driver was able to speed away to safety.

Ÿ On May 14, 1904, the first Olympic Games to be held in the U.S. opened in St. Louis, Missouri. The Games had initially been awarded to Chicago, but were later given to St. Louis to be staged in connection with the St. Louis World Exposition. Unfortunately, the Games were poorly organized and overshadowed by the fair.

Ÿ On May 15, 2009, General Electric, one of...

On May 6, 1979, more than 65,000 anti-nuclear power demonstrators marched on the U.S. Capitol in protest against more nuclear power plants. Consumer advocate Ralph Nader had described nuclear power as “our country’s technological Vietnam.” The group was formed after the accident at the Three Mile Island nuclear plant.

On May 7, 1934, the Pearl of Lao Tzu, almost 10 inches around and weighing about 14 pounds, was found by a diver in a giant clam in the Palawan Sea. Gemologists did not consider it to be a true pearl, however, as it did not have the iridescence of true pearls.

On May 8, 1988, Stella Nickell, who put cyanide in Excedrin capsules, including her husband’s, as well as...

On May 6, 1979, more than 65,000 anti-nuclear power demonstrators marched on the U.S. Capitol in protest against more nuclear power plants. Consumer advocate Ralph Nader had described nuclear power as “our country’s technological Vietnam.” The group was formed after the accident at the Three Mile Island nuclear plant.

On May 7, 1934, the Pearl of Lao Tzu, almost 10 inches around and weighing about 14 pounds, was found by a diver in a giant clam in the Palawan Sea. Gemologists did not consider it to be a true pearl, however, as it did not have the iridescence of true pearls.

On May 8, 1988, Stella Nickell, who put cyanide in Excedrin capsules, including her husband’s, as well as...

DEAR PAW’S CORNER: I adopted a sweet but somewhat rambunctious little mutt, “Karla,” who is about 13 months old. The problem is that she wants to jump and bark at other dogs when we’re out for a walk. How can I calm her down? — Jen in Duluth, Georgia

DEAR JEN: Reactivity is natural behavior for a puppy that loves to play with other dogs, but of course, it’s not desirable behavior. Jumping and barking can trigger an aggressive response from some dogs, or stress out other dogs. It can scare humans.

Fortunately, it’s a behavior that you can moderate with a specific, daily training regime that will teach Karla to stay calm on the leash.

First, gather your tools: A sturdy...