Must reads before Monday

PHOTO: Former presidents George H.W. Bush and Bill Clinton arrive in Phuket, south Thailand, Feb. 18, 2005.PlayRoslan Rahman/AFP/Getty Images, FILE
WATCH Former President Clinton reads note left by George H.W. Bush: 'I love that letter'

A heartfelt letter from one president to another, the role domestic violence plays in some mass shootings, northern elephant seals are developing a new language, a former Kansas City Chiefs running back asks for forgiveness, and love conquers all -- even the bottom of a sidewalk grate in New York City.

Don’t miss out on some of ABC News' best reporting from this week.

'Dear Bill': Clinton reads heartfelt letter from President George H.W. Bush

VIDEO: Former President Clinton reads note left by George H.W. Bush: I love that letter Play
Former President Clinton reads note left by George H.W. Bush: 'I love that letter'

Former President Bill Clinton read the letter his predecessor, George H.W. Bush, who died Friday, left for him when he came into office. The 41st president of the U.S. told the young Democrat who had just defeated him: "You will be our president when you read this note. I wish you well. I wish your family well."

"I love that letter," Clinton said.

PHOTO: A note written by George H.W. Bush to Bill Clinton. George H.W. Bush Presidential Library and Museum via AP
A note written by George H.W. Bush to Bill Clinton.

Domestic violence plays a role in many mass shootings, but receives less attention: Experts

PHOTO: People attend a rally against gender-based and sexual violence against women in Madrid, Spain, Nov. 25, 2018. Sergio Perez/Reuters
People attend a rally against gender-based and sexual violence against women in Madrid, Spain, Nov. 25, 2018.

Of the 18 mass shootings that ABC News has identified this year, nine of the incidents were instances of either intimate partner or family violence.

Northern elephant seals have a more diverse language now that their populations are thriving

PHOTO: A male Elephant seal at the Ano Nuevo State Reserve, Jan. 13, 2010, in California. Barry Bland/Barcroft Media/Getty Images
A male Elephant seal at the Ano Nuevo State Reserve, Jan. 13, 2010, in California.

The "language" of elephant seals is much more diverse than it used to be, according to a new study. Researchers compared elephant seals' calls from four breeding sites along the western coasts of the U.S. and Mexico, using audio that was collected from 1968 to 1969, and 2014 to 2015.

"It's quite colorful with respect to acoustics," one researcher told ABC News.

Former NFL star running back Kareem Hunt addresses assault video: 'I deserve forgiveness'

PHOTO: In this Oct. 8, 2017, file photo, Kansas City Chiefs running back Kareem Hunt warms up for the teams NFL football game against the Houston Texans in Houston. AP
In this Oct. 8, 2017, file photo, Kansas City Chiefs running back Kareem Hunt warms up for the team's NFL football game against the Houston Texans in Houston.

Kareem Hunt, who was placed on the commissioner exempt list and cut by the Kansas City Chiefs this week, said he was "ashamed" after a video emerged showing him beating and kicking a 19-year-old woman. Hunt said he's "sorry," but "deserves forgiveness" and a second chance to play in the NFL.

NYPD finds couple who lost diamond ring in sidewalk grate

PHOTO: The NYPD posted this photo to their Twitter account on Dec. 2, 2018, with the caption Thank you, Twitter. Case closed! Love, John, Daniella, and the NYPD. NYPD
The NYPD posted this photo to their Twitter account on Dec. 2, 2018, with the caption "Thank you, Twitter. Case closed! Love, John, Daniella, and the NYPD."

A newly-engaged couple who lost their diamond ring down a sidewalk grate in Times Square can thank the NYPD for finding it -- and the "Twitterverse" for helping authorities track them down.

"It's like finding a needle in a haystack," said one police officer.