Here's a look at the week ahead on our "Sunday Morning" Calendar:
Monday sees the 118th running of the Boston Marathon, the first since the bombing last year that killed three people and wounded 260 others.
- 2014 Boston Marathon (Boston Athletic Association)
- Follow the Boston Marathon on Twitter and Facebook
- Complete CBSNews.com coverage: Boston Marathon bombings
Tuesday is Earth Day, a day for action to protect the environment, with an emphasis this year on Green Cities.
- Earth Day Network
- Follow the Earth Day Network on Twitter and Facebook
- Useful mobile apps for saving energy - and money (CBSNews.com)
Wednesday is the ninth anniversary of the first YouTube video, a 19-second clip called "Me at the Zoo," posted by You Tube co-founder Jawed Karim.
Thursday sees the return to competitive swimming of Olympian Michael Phelps, who's entered in three events at the Arena Grand Prix in Mesa, Ariz.
- 2014 Arena Grand Prix at Mesa (USA Swimming)
- Michael Phelps Foundation
- Follow Michael Phelps in Twitter and Facebook
On Friday, Northwestern University's scholarship football players vote on whether to form a union, after getting the green light from a National Labor Relations Board official.
- Northwestern Wildcats, Northwestern University
- National Labor Relations Board
- College athletes can unionize, federal agency says (CBS News)
- Video: Armen Keteyian on ripple effect of unionization decision (CBS This Morning)
And on Saturday, a section of stage wall from "The Ed Sullivan Show" signed by The Beatles goes up for auction.
- Music Memorabilia Auction, April 26 at Heritage Auctions, New York
- Gallery: The Beatles: Backstage at "The Ed Sullivan Show"
- Complete CBSNews.com coverage: The Beatles' U.S. invasion