The world's 14 "eight-thousanders" -- mountains taller than 8,000 meters (26,247 feet) -- are all located in Asia. On one hand, they really beautify a horizon, but on the other they present a fierce, at times fatal, challenge to mountain climbers. Beauty can, indeed, be deadly. Here's the "baby" of the bunch, Shishapangma in Tibet, peaking at 8,027 meters (26,335 feet).
This is Gasherbrum II (we'll have another Gasherbrum coming up shortly), on the border of Pakistan and China. It's 8,035 meters up in the sky (26,361 feet) and is sometimes known as K4. These mountaineers are near the summit.
Ed Darack/Science Faction/Corbis
On the left side of this picture we see the sheer mass of Broad Peak, the 12th highest mountain on the planet at 8,047 meters or 26,394 feet above sea level.
As promised, here's another Gasherbrum: Gasherbrum I. (Gasherbrum, translated from the Tibetan language Balti, means "beautiful mountain.") It also goes by the name of K5, lives along the China-Pakistan border and is 8,080 meters (26,444 ft) high.
The Himalayan mountain range Annapurna, in Nepal, is seen here from Pkhara, about 124 miles (200 kilometers) west of Kathmandu. Annapurna is considered one of the most dangerous for climbers; first crested in 1950, it has since been climbed by more than 100 people but taken 53 lives along the way.
This somewhat unsettling photo was taken in 1931 by mountaineers at a base camp on Pakistan's Nanga Parbat, the ninth-tallest eight-thousander at 8,126 meters (26,660 feet). The area captured in the picture is known as the Nanga Wall.
Association Chantal Mauduit Namaste/Corbis/Sygma
Eighth-tallest of the eight-thousanders is Nepal's Manaslu, at 8,163 meters (26,781 feet).
The Dhaulagiri mountain range in the Himalayas sports a rather volcanic look in this picture, with the sun brushing its top. But Nepal's 8,167-meter (26,795-foot) monster is of course quite chilly on top. Dhaulagiri's south face is considered by mountaineers to be a next-to-impossible climb, and no one has ever topped the mountain from that side.
Clouds hover over snow-covered Cho Oyu mountain in Tibet. The sixth-tallest mountain stands 8,201 meters tall (26,906 feet), and the "Mountain Goddess" (in Tibetan translation) is considered one of less-challenging climbs among the eight-thousanders (if you don't consider climbing ANY mountain a challenge, that is!).
Next in the eight-thousander club is Makalu, the fifth-highest mountain in the world, looming on the border between Nepal and China. It's 8,463 meters (27,766 feet) tall and is another tough climb, with 22 deaths tallied against its 206 successful climbs.
Pal Teravagimov Photography
Standing 8,516 meters tall (27,940 feet), Lhotse, fourth-tallest, rests on the border of Nepal and Tibet. It was first climbed in 1956.
Kangchenjunga, in Nepal, is the world's third-tallest mountain, edging Lhotse by just 71 meters, standing 8,587 meters tall (28,169 feet). It's a prominent mark on the horizon in Darjeeling, the tea-growing region.
K2, the second-tallest mountain on the planet, is 8,611 meters up in the clouds (28,251 feet) along the China-Pakistan border. Climbers know it for its incredibly difficult ascent routes; in 2008, an ice fall on the treacherous slopes took the lives of 11 climbers.
And now we reach the Big Daddy in the worldwide mountains club. That, of course, would be Mount Everest. Its name alone is synonymous with challenging feats, as climbing it continues to this day to be a dicey endeavor, though it draws people year after year to attempt the ascent. And what a climb: Mount Everest stands 8,848 meters tall (29,029 feet). It was famously crested for the first time in 1953 by New Zealand climber Edmund Hillary and Nepalese Sherpa mountaineer Tenzing Norgay.
Could a test tell you if you’re a good candidate to hike Mt. Everest? Hiking to high altitudes can be risky for many reasons, but chief among them is how your body will respond to the reduced oxygen. Almost a third of hikers who trek above 2,500 meters shows signs of acute mountain sickness. And 1-2 percent develop life-threatening conditions.
Until now, though, there’s been no way of knowing which 30 percent of people will experience the headaches, nausea, dizziness, fatigue, loss of appetite and other symptoms of the illness. But today, a team of researchers is presenting a test that they say can identify those who will get acute mountain sickness.
Right now, the test can only be conducted after four hours at high elevation. Future tests would hopefully identify someone at risk before they even reach Base Camp.
“Our results suggest that it is possible to identify vulnerable individuals and suggest particular behaviors and drugs only to this subgroup,” lead author Dr. Rosa Bruno said in a press release. “Thus we can limit drug use (and side effects) only to those who will really need them, and give them special advice and recommendations such as avoiding high altitudes or spending more time ascending to allow time for acclimatization.”
The key proved to be combining two known physiological responses to altitude: oxygen saturation in the blood and the systolic function of the right ventricle. Separately measured, they didn’t predict who would get sick, but the combined results did.
“The test is very simple and quick: O2 saturation can be measured very easily by anyone, and a low-cost, portable ultrasound machine is sufficient for the (ventricle) measurement,” Bruno said. “Future steps will be to test whether a shorter length of stay and/or experimental hypoxia (induced in the lab by breathing air with a reduced content of O2 with a mask) are equally informative. If we obtain good results (in a larger population) with these further experiments, this easy test can be used in the very near future.”