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In a group of 23 people the mathematical probability is more than half (.507) that two of them will have the same birthday. This is unintuitive but true! Let's test it out.

Major League Baseball teams have an active roster of 25 men. The probability is .569 that a team will have two players with the same birthday.

Angels

Astros

Feb 20 Justin Verlander, Brian McCann

Athletics

Feb 1 Brett Anderson, Sean Manaea
Mar 29 Matt Olson, Chad Pinder

Blue Jays

Braves

Brewers

Feb 10 Jorge Lopez, Brandon Woodruff
Mar 26 Jett Bandy, Hernan Perez

Cardinals

Cubs

Diamondbacks

Dodgers

Mar 11 Pedro Baez, Rich Hill
Nov 23 Ross Stripling, Justin Turner

Giants

Indians

Oct 19 Josh Tomlin, Rajai Davis

Marlins

Mariners

Mets

Jun 19 Jacob deGrom, Devin Mesoraco

Nationals

Jul 20 Stephen Strasburg, Pedro Severino

Orioles

Padres

Phillies

Apr 8 Zach Eflin, Carlos Santana

Pirates

Rangers

Rays

Aug 10 Anthony Banda, Wilson Ramos
Dec 31 Alex Colome, Ryan Yarbrough

Red Sox

Aug 21 Christian Vazquez, J.D. Martinez

Reds

May 3 Homer Bailey, Amir Garrett

Rockies

Royals

Feb 10 Tim Hill, Alex Gordon

Tigers

Twins

Apr 19 Zach Duke, Joe Mauer
Dec 15 Trevor Hildenberger, Ryan Pressly

White Sox

Dec 9 Bruce Rondon, Adam Engel

Yankees

Sep 6 Tyler Austin, Clint Frazier

Of 30 teams 15 had 2 players with the same birthday.
15/30 is 0.50