The photoelectric effect is the emission of electrons (called "photoelectrons") from a surface when light is shone on it. It was first observed by Alexandre Edmond Becquerel in 1839, although credit is usually reserved for Heinrich Hertz, who published the first thorough investigation in 1887. Another particularly thorough investigation was published by Philipp Lenard in 1902. Einstein's 1905 paper discussing the effect in terms of light quanta would earn him the Nobel Prize in 1921, when his predictions had been confirmed by the experimental work of Robert Andrews Millikan. The Nobel committee awarded the prize for his work on the photo-electric effect, rather than relativity, both because of a bias against purely theoretical physics not grounded in discovery or experiment, and dissent amongst its members as to the actual proof that relativity was real.
What is the photoelectric effect?
the emission of electrons (called "photoelectrons") from a surface when light is shone on it

Rookie Starlin Castro debuted in early May (2010) as the starting shortstop. However, the club played poorly in the early season, finding themselves 10 games under .500 at the end of June. In addition, long-time ace Carlos Zambrano was pulled from a game against the White Sox on June 25 after a tirade and shoving match with Derrek Lee, and was suspended indefinitely by Jim Hendry, who called the conduct "unacceptable." On August 22, Lou Piniella, who had already announced his retirement at the end of the season, announced that he would leave the Cubs prematurely to take care of his sick mother. Mike Quade took over as the interim manager for the final 37 games of the year. Despite being well out of playoff contention the Cubs went 2413 under Quade, the best record in baseball during that 37 game stretch, earning Quade to have the interim tag removed on October 19.
Who announced on August 22nd they were leaving the Cubs prematurely?
Lou Piniella

The law of the Eastern Catholic Churches in full union with Rome was in much the same state as that of the Latin or Western Church before 1917; much more diversity in legislation existed in the various Eastern Catholic Churches. Each had its own special law, in which custom still played an important part. In 1929 Pius XI informed the Eastern Churches of his intention to work out a Code for the whole of the Eastern Church. The publication of these Codes for the Eastern Churches regarding the law of persons was made between 1949 through 1958 but finalized nearly 30 years later.
When did Pius XI announce his goal of codifying the law of all Eastern Churches?
1929