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UCSF experts in gene editing and bioethics weigh in on the news of Chinese researcher He Jiankui’s announcement of the birth of the first babies who had their DNA edited as embryos.

The NHL expanded Tuesday, announcing Seattle as its 32nd franchise. Here's how every North American league could broaden its geography.

Mets executive Jeff Wilpon said the team aggressively pushed to acquire Edwin Diaz in part to "block" the rival Phillies from trading for the All-Star closer.

Philadelphia addressed a huge need at short with Jean Segura, while Seattle is giving J.P. Crawford a chance to meet his considerable potential.

Fentanyl most likely spread because of heroin and prescription pills shortages, and also because it was cheaper for drug wholesalers than heroin.

Bottlenecks at certain positions in free agency could mean a slow offseason for players looking for new teams.

Hitters 25 and under weren't just good in 2018. They were historic.

The Phillies have traded for Mariners All-Star infielder Jean Segura. The deal sends first baseman Carlos Santana and shortstop J.P. Crawford to Seattle.

The Red Sox have accepted an invitation to the White House. Manager Alex Cora says he'll be there despite voicing frustration over President Trump's comments on Puerto Rico. He says he respects the president and will use the visit for good.

The Phillies have traded for Mariners All-Star infielder Jean Segura. The deal sends first baseman Carlos Santana and shortstop J.P. Crawford to Seattle.

A swap with Seattle is on the verge of bringing an All-Star shortstop to Philadelphia. Does the move help or hurt the franchise's chances of adding one of this winter's biggest free agents?

The Mariners have completed the deal that will send Robinson Cano and ace closer Edwin Diaz to the Mets for two highly rated prospects as well as outfielder Jay Bruce, reliever Anthony Swarzak and right-hander Gerson Bautista.

Seibu Lions ace left-hander Yusei Kikuchi is available to major league teams starting Tuesday, and will have until Jan. 2 to sign with a major league club. The Yankees are expected to be among those interested.

Manager Dave Roberts, who just led the Dodgers to their second straight World Series in three seasons at the helm, has agreed on a four-extension with Los Angeles through 2022.

A new study is using electronic health records to guide management of newborn weight loss.

Despite his lengthy injury history, a deep dive into the numbers shows why signing the center fielder this winter might be a smart move.

Between free agents and potential trades, the premium pitchers teams might pursue this offseason offer big benefits -- and a few risks.

Touched by the events in the area they call home, Brewers teammates Christian Yelich, Ryan Braun and Mike Moustakas are raising money to help out.

The Phillies are close to trading for Mariners All-Star infielder Jean Segura, according to multiple reports. The deal would involve multiple players and requires Segura to waive his no-trade clause.

In betting that Robinson Cano and Edwin Diaz will defy baseball trends, New York gave away a big part of its future for a chance to be better right now.