Zeon Zoysia, golf grass of the Rio Olympics

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Golf will return to the Olympics for the first time in more than a century when it’s contested (with or without Rory McIlroy) at the Rio Games in 2016. And while we’ve been waiting way too long to get the course construction under way, officials announced that roughly eighty-eight percent of the grass used will be Zeon Zoysia.

“Zeon Zoysia is very environmentally friendly,” David Doguet, president of Blade Runner Farms, said Monday. “The grass needs very little water, and very low amounts of nitrogen fertilizer, while still looking and playing great. The grass will create a world-class playing surface for the Olympics, and for many years to come.”

The chosen grass will cover the fairways, tees, and rough. But Dr. Frank Rossi, a consulting agronomist from Cornell University, said at the Golf Industry Show in San Diego Monday that they can’t determine which grass will be used for the greens until they test the quality of water available for irrigation.

“If the water is good, the greens will be an ultradwarf bermudagrass. The surrounds will be another type of bermudagrass. If the water is not good, the greens and surrounds will be some type of paspalum because the bermudagrass may not hold up to poor quality water.”

A course designed by Gil Hanse to accomodate the Olympic galleries is set to be constructed about three miles from the Olympic Park in Rio, but disputes over land ownership are holding up the process.

The secret messages Lindsey Vonn wrote on her Olympic race suit

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SCHEDULE UPDATE: Vonn will will return for the final women’s downhill training run on Monday at 9 p.m. ET. LIVE STREAM

Look closely at Lindsey Vonn.

When NBC cameras zoom in on the two-time Olympic medalist, viewers will notice that she wrote a couple of messages on her uniform in permanent marker.

On the thumb of her right glove, Vonn has the word “believe” in Greek. It mirrors a tattoo she has on the inside of a finger.

“Signifying my last Olympics [in 2018] and just need to believe in myself,” Vonn said to NBC’s Nick Zaccardi.

On her helmet, Vonn has the initials “D.K.” and a heart. It is meant to honor her late grandfather, Don Kildow.

Kildow, who served in the Korean War from 1952-54, died on Nov. 1. Watch to learn more about Vonn’s special relationship with her grandparents:

Hard falls at Olympics, but no hard rules about concussions

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PYEONGCHANG, South Korea (AP) — At the bottom of the Olympic aerials landing hill, where crashes are common and the term “slap back” is part of the everyday lingo, skiers spend almost as much time figuring out how to protect their heads as they do working on all those flips and spins.

“We learn how to fall,” U.S. jumper Jon Lillis said.

Elsewhere around the action-sports venue, that’s not so much the case.

Concussion dangers lurk everywhere — from the iced-over deck of the halfpipe, to the steeply pitched landings on the slopestyle course, to the careening twists and turns of the snowboard cross track, to the aerials course, where “slap back” is the term for when a skier’s head slaps backward against the snow. But at the Olympics, there are no hard-and-fast rules regarding who diagnoses head injuries, and no hard-and-fast protocol that athletes must clear to be allowed back on the slopes after a concussion.

“A bit concerning,” says neurologist Kevin Weber of the Ohio State Wexner Medical Center. “Because you worry that athletes in other sports that may not be as popular as football are getting, I wouldn’t say ignored, but the concussions they’re getting are under-scrutinized.”

Read the full story at NBCOlympics.com