Why is there a baby formula shortage?; Latino community honors Cesar Chavez; Lin Manuel Miranda reacts to Arizona off-Broadway musical

A look at some of today's top stories, the weather forecast and a peek back in history.

Here's the reason baby formula like Enfamil and Similac is in short supply and why homemade formula and non-human milk substitutions are bad options.

On May 11, 1972, Cesar Chavez started a 24-day fast in Santa Rita Hall in Phoenix. 50 years since, activists call on younger generations to learn from him.

"Hamilton," "In the Heights" creator Lin-Manuel Miranda saw the Arizona-born off-Broadway musical "¡Americano!" at New World Stages in New York City.

Today, you can expect it to be sunny, with a high near 104 degrees. Mostly clear at night, with a low near 71 degrees. Get the full forecast here.

Today in history

• On this date in 1919, 2nd Lt. Frank Luke Jr. of Phoenix was posthumously awarded the Medal of Honor for gallantry in action beyond the call of duty.
• In 1920, delegates to the district meeting of the State Women’s Clubs in Phoenix exchanged heated words over the required medical examinations of students in public schools. Some called the requirements “un-American.”
• In 1927, the first passenger train of the Southern Pacific of Mexico Railroad left Nogales for Guadalajara.
• In 1928, Mexican and American firefighters in Nogales joined efforts to save the famous Nogales Brewery, but the building was completely destroyed by the fire.
• In 2003, more than 100 immigrants were abandoned in a locked trailer at a Texas truck stop; 19 of them died. (Truck driver Tyrone Williams was later sentenced to nearly 34 years in prison for his role in the deaths.)