The Weight of Everest

Discover the 30,000-year-old biological ghost story that allows a 130-pound porter to carry a refrigerator to the roof of the world.

[Speaker 1]: I want you to start by visualizing something very specific. Imagine walking into your kitchen and unplugging your refrigerator. An average fridge weighs about 200 pounds. [Speaker 2]: Which is heavy, but manageable for a couple of strong movers with a dolly. [Speaker 1]: Right. But now, imagine strapping that refrigerator directly to your back. No dolly. No wheels. And then, imagine carrying it up a flight of stairs. [Speaker 2]: Most people couldn't even lift it off the ground, let alone climb with it. And we aren't talking about a single flight of stairs. We’re talking about doing that for six to eight hours a day. [Speaker 1]: In an environment where there is 50 percent less oxygen than there is at sea level. [Speaker 2]: This isn't a hypothetical physics problem. This is the daily commute for porters in the Himalayas. We’ve all seen the photos of Everest-the triumphant climber in the bright yellow down suit. But just out of frame, or often miles ahead of them on the trail, is a local porter carrying a load that biomechanically shouldn't be possible. [Speaker 1]: We hear phrases like "Sherpa strength" all the time, and it usually feels like a myth. A romantic idea about willpower. But it turns out, it’s actually a matter of hard biology. [Speaker 2]: Today, we are looking at the mechanics of the human body at the absolute extremes. How a specific genetic mutation from an extinct species, a technique that defies standard orthopedics, and a brutal economic reality allow a 130-pound person to carry a 200-pound load to the roof of the world. [Speaker 1]: Keep that refrigerator in mind. Because by the time we’re done, you’ll see that carrying that weight isn't just about muscle. It’s about a ghost story that’s 30,000 years old. [Speaker 2]: And the cost of telling it. [Speaker 1]: Before we get into the biology, I think we need to clear up the identity piece. Because "Sherpa" is probably one of the most misused words in the English language. [Speaker 2]: It is. Most Westerners use it as a job title. You know, "he is my Sherpa," meaning "he is my porter." But Sherpa is an ethnicity. They are a Tibetan ethnic group who migrated to the Solukhumbu region of Nepal about 500 years ago. [Speaker 1]: But their history on the high plateau goes back much further than that. [Speaker 2]: Right, estimates put their ancestors on the Tibetan Plateau for at least 6,000 years. Historically, they weren't mountaineers. They were traders and farmers. They moved salt and wool over the Nangpa La pass-that’s a trade route at 18,000 feet connecting Nepal and Tibet. [Speaker 1]: So the "job" of high-altitude portering... that’s a relatively new invention? [Speaker 2]: Essentially invented by the British in the early 1900s. When they couldn't access Everest from the south, they recruited Sherpas in Darjeeling because they noticed something critical: these men didn't get sick when the Europeans were gasping for air. [Speaker 1]: And that physiological difference is what we’re going to unpack. Because later, we’ll look at the specific gene that stops Sherpas from getting "thick blood"-a trait they inherited from a species that no longer exists. [Speaker 2]: But first, we have to look at the economics. The tipping point was 1953. Tenzing Norgay summits with Edmund Hillary. Suddenly, the Sherpa goes from support staff to international icon. [Speaker 1]: And that created a massive industry. Today, the labor economy is incredibly stratified. You have the "Climbing Sherpas"-the elite guides. They’re fixing ropes, they’re summiting,…