Wynne Davis

Updated at 3:46 p.m. ET

A U.S. service member and two Defense Department contractors were killed Sunday when the terrorist organization al-Shabab attacked a Kenyan airfield used by both Kenyan and U.S. forces.

Two Defense Department members were also injured in the attack, according to United States Africa Command. They are said to be in stable condition.

Dinner parties often come with expectations and stress, but author Alison Roman wants you to know it doesn't have to be that way.

In her new cookbook, Nothing Fancy, Roman stresses that preparing dinner for others doesn't have to be a piece of performance art. It's dinner and doesn't have to be perfection.

"I feel like taking the word entertaining out of something just immediately alleviates anxiety, because what I realized is also when you rebrand it as having people over, it not only makes you feel less anxious, but your guests, [too]," Roman says.

The Houston Astros beat the Washington Nationals 8-1 in Game 4 of the World Series to tie it up 2-2.

After losing the first two games at home, the Astros came back to win Game 3 in Washington and continued that momentum through Game 4.

Second-baseman José Altuve was the first Astro to get on base in the first inning while facing Washington's starting pitcher Patrick Corbin. Left-fielder Michael Brantley came up next with another single before third baseman Alex Bregman hit an RBI that gave the Astros their first run of the night.

Kenya's Brigid Kosgei won the Chicago Marathon on Sunday with a time of 2 hours 14 minutes 4 seconds, breaking the previous world record by 81 seconds.

At 25, the Kenyan defended her title after winning last year's event, and put almost 7 minutes between herself and her competition. Both from Ethopia, Ababel Yeshaneh finished second with a time of 2:20:51 and Gelete Burka came in third at 2:20:55.

The previous world record time of 2:15:25 was set by Britain's Paula Radcliffe in 2003 at the London Marathon.

After yet another standout performance, star gymnast Simone Biles can now add two more signature moves that bear her name to her already lengthy list of accomplishments.

In order for a gymnast to have a move named after them, they must submit it for consideration and successfully land it at a major competition, such as the world championships or the Olympics.

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