New Technology May Lead To Light- And Heat-Sensitive Tent

by Sean McLachlan on


The tent we’re all familiar with from camping trips may soon be old tech thanks to a new material designed by a team of Harvard scientists.

Researchers at the Wyss Institute for Biologically Inspired Engineering have announced in a press release that they’ve developed a flexible material that can shed or retain moisture, and turn from opaque to transparent.

You can see how it works in the image below. The material is a liquid-repellent film that coats, and is infused in, an elastic porous backing. Normally the surface is flat and will shed water, but when the backing is stretched it changes the size of the pores, causing the surface to become rough and retain droplets.

In its normal state the material is transparent, but when stretched it becomes opaque. The material could be used to make a tent that blocks light on a dry and sunny day, and becomes transparent and water-repellent on a dim, rainy day.

The material may also be used in products as diverse as contact lenses and water pipes.

Researchers were inspired by the function of tears, which block materials from damaging the eye, and flush out these materials, yet remain transparent. Such inspiration is typical of work at the Wyss Institute, which looks to nature to find solutions to technological problems.

Top image courtesy Krish Dulal. Bottom image courtesy Harvard University.

Gadling Goes Underground: More Explorations Of Caves In Spain

by Sean McLachlan on


The caves in Spain are famous for their variety and extent. Some delve more than a kilometer into the ground. Others are adorned with prehistoric cave art more than 10,000 years old. Almost all have beautiful rock formations. There’s a whole other world under the one we usually see.

As I mentioned in a previous post, I’m taking a course on caving. My first experience was in Cañuela cave, an easy cave suitable for beginners. Last weekend we went to Coventosa in a remote valley in the Sierra de Cantabria, a tougher cave system that requires more rope work.

The first challenge is what you see in this photo. Here I am worming my way into a little tunnel that slopes down at a steep angle. As you can see I’m tied in with a pair of carabiners attached by ropes to my harness. Why? Because at the end, the tunnel opens out onto the edge of a cliff. Start sliding uncontrollably down this tunnel and you could fly right off the cliff, fall ten meters and smash into a bunch of jagged rocks.

Coventosa is an active cave with some amazing formations. Water seeping through cracks in the rock leaves mineral deposits that harden into stone. Over vast periods of time, these accumulated deposits create stalactites, stalagmites, columns and other formations. Several walls were full of shellfish fossils, evidence that the area was once underwater. Exploring caves gives you an appreciation for how incredibly old yet constantly changing our planet is.

%Gallery-183046%Normally as the water drips down it will create a stalactite hanging from the ceiling. The water hits the floor below, leaving more deposits to create a stalagmite rising from the ground. Eventually these two features will meet to form a column.

If the water is dripping more slowly, sometimes instead of a stalactite you’ll get a soda straw, which looks exactly like what it’s called. These tend to hang straight down or at a bit of an angle if the water is pushed by an air current. Some soda straws eventually turn into stalactites, while others cling to the side of existing stalactites and grow at crazy angles, with the water seemingly defying gravity. There are various theories as to how this could happen, which means that scientists really don’t know what’s going on. We still have a lot to learn about our world.

Caves are one of the last frontiers left to us for exploration. New caves are being discovered every year, and additional tunnels in existing caves are being explored regularly. Caving is pretty much the only way a regular person can discover a previously unseen part of the world.

While I’m years away from that level of skill, the caves in Spain are already giving me a taste of that feeling. How many people have been to the Beach, a stretch of sand next to an underground lake so large that it defied my attempts to photograph it? Or visited the Ghosts and the Virgin Mary, a cluster of eerie stalagmites in one of the deepest parts of Coventosa Cave?

Then there was my favorite, a low gallery with a forest of columns half submerged in water. Our lights couldn’t penetrate to the far wall. As we crouched there, one of the students asked how far it extended. The instructor said it didn’t go much further than we could see and was sealed off by a rock fall at the end. That made me wonder – what if we took away the rocks? Was there a tunnel on the other side? Where would it lead?

Passing between these sights got tricky at times. On one cliff we had to tie into the rope, get around a difficult outcropping, then secure our protection to a second rope. Going up that same route was even more difficult and a couple of us (myself included) made the rest wait as we fiddled around trying to find the best way to do it.

While caving can be physically demanding, it requires more balance and focus than pure strength. The best student in our class is a young woman who is a foot shorter than I am, who flies up and down the ropes with far more ease, and an obvious natural talent. This is a sport that any reasonably fit person can do.

Even so, by the end of the day we were all worn out. As we emerged from the cave entrance we were greeted by the deep blue sky of evening. We’d been in the cave for nine hours and the day had passed us by. Jupiter and a crescent moon shone high above the peaks. In that other world you lose track of time. Now that I’m back in the regular world with its sky and its clocks, I’m marking time again until next Saturday, when I’ll try an even more challenging cave.

[Photo by Dani]

Caving In Northern Spain

by Sean McLachlan on


After living a year in Santander in Cantabria, northern Spain, I had a problem. I was chronically, unutterably, and perhaps terminally bored. Santander is a sleepy regional town, and while weekend hikes and trips for Gadling helped ease my boredom somewhat, I was still not getting my drug of choice – a long-term, low-level adrenaline high.

There’s nothing like it. Do something captivating and somewhat perilous for a period of a few hours to a few weeks and you’ll feel more alive than any amount of booze or drugs can ever make you. My trips to Iraq and Somaliland were two of the biggest benders of my life, but they also came with a bad case of withdrawal. So, at age 43 in a town I didn’t like, I needed to find a regular adrenaline fix.

How about learning an extreme sport in a foreign language with a bunch of people half my age?

Yeah, that should work.

Cantabria is one of the best regions in Europe for caving, and luckily the Federación Cántabra de Espeleología offers annual classes. I already had some experience caving in Missouri and New Mexico, but that was 15 years ago. Plus techniques are somewhat different in Europe and technology has changed over time. So I took a beginners’ class. This is not the sort of sport where you exaggerate your ability. That could land you in serious trouble.

%Gallery-181190%The course started off with a series of lectures that provided me a long list of Spanish words I hadn’t picked up making the rounds in bars. This was followed by a practical class at an abandoned quarry. While most of my fellow students were from the local university, I was glad to see a couple of others who looked like they knew what it was like to have kids instead of just be one.

We spent all day learning to ascend and descend. Unlike rock climbing, the point isn’t to take the most challenging way up a cliff, but rather get up there as easily as possible in order to save energy for exploring the cave. You wear a harness similar to a climbing harness. For ascending, you tie into the rope with a Croll, which has a blocking device that allows you to go up the rope but stops you from moving down. Another device that locks into the rope is called a puño (fist) and has a strap with a loop that goes around your foot. The puño has a blocking device like the Croll and you move up the cliff by doing a series of one-legged deep-knee bends, worming your way up the rope like a caterpillar.

For descending you switch to an locking pulley called a Stop that allows you to safely rappel down. Switching from ascent to descent requires securing yourself with the aid of two carabiners on ropes tied to your harness and making sure you disengage and secure the equipment in the proper order.

Beginners at a sport always expend far more energy than they need to. I was no exception. Once I got to the top of the quarry wall for the first time, I started switching over from my ascending gear and securing my Stop so I could descend. Each step is safe if you do it right, because at least two devices are securing you to the rope or wall protection at any time. Despite this, my mind was still in rock climber mode and I was trying to do it all with one hand as my other hand gripped a ledge. One foot was on a good hold and the other had a halfway decent smear.

This, of course, was entirely pointless since I was properly secured through my gear. Just then one of the instructors popped his head over the cliff top.

“Why are you hanging on?” he asked.

I didn’t have an answer for him.

“Let go,” he told me.

I let go.

“Now hang there for a minute.”

OK, lesson learned. I got back to work.

“It’s easier with two hands, isn’t it?” he said.

We finished the day worn out but successful. The class all made it through the techniques without injury, even that older foreign guy who made everything more difficult for himself.

Now came the real test: Cañuela Cave in the beautiful Sierra de Cantabria. Our instructors were easy on us and picked a cave with little technical work. The entrance is like an airplane hanger, a huge hole in the hillside sloping into darkness. Not far in, the tunnel starts to narrow and the floor gives out. The only way to continue is along a rounded hump that slopes off at a steep angle to the jagged rocks below. A rope is secured along it and by tying in with the carabiners attached by short ropes to our harness we were able to traverse this pretty quickly.

Now all daylight was behind us and we started to see rock formations such as stalactites, stalagmites, curtains and more. The route opened up into echoing galleries and then narrowed down into smaller rooms. One room was nearly circular and fringed with stalactites reaching almost to the ground, making it look like a giant petrified birdcage.

A bit beyond, we had to use the Stop to descend a cliff. A second, deeper one came later. I couldn’t see the bottom from my vantage point. As I’ve mentioned before, I’m scared of heights. All through university I went rock climbing in order to conquer my fear. I never did; I only learned to ignore it and get on with what I was doing. Discovering that you can live with the source of your fear without being affected by it was the most important thing I learned in university.

I thought I may have trouble with caving, but it turned out I didn’t. At the quarry I was too busy fiddling with the new equipment to even notice. In the cave, not being able to see the bottom made going over the edge easier somehow. No, that doesn’t make any sense – phobias never do.

More wonders followed: a lone bat clinging upside down to a rock, stalactites formed at an angle because of air currents, fossils stuck into the wall. Check out the gallery for just a small selection, and stay tuned for more underground adrenaline highs. I’ll be going into more detail about the world underneath our feet and the sport that helps you explore it.

[Top photo by Sean McLachlan. Bottom photo of yours truly wearing his helmet at a rakish angle taken by Dani “that guy in the caving class whose last name I should have learned.”]

Mount Kilimanjaro Defeats Jordanian Princess

by Sean McLachlan on


It looks like money and privilege can’t buy everything.

Princess Sarah Princess Sara bint Al Faisal of Jordan, niece of King Abdullah II, failed to climb Mount Kilimanjaro, the Tanzania Daily News reports.

The 18-year-old princess tried to scale the famous mountain last weekend with a large entourage of assistants and Jordanian international students. She reached the Kibo point at 4,700 meters (15,420 feet) but developed altitude sickness. Doctors climbing with her advised her to descend instead of attempting to reach the mountain’s highest summit, Uhuru point at 5,895 meters (19,341 feet).

Symptoms of altitude sickness include headaches, dizziness, shortness of breath, rapid pulse and more. For full coverage see this PDF document. To prevent altitude sickness, it’s best to ascend in stages, staying overnight at an intermediate altitude to give the body time to adapt. The only cure of altitude sickness is to descend to a lower altitude, which should be done immediately.

It’s difficult to predict who will get altitude sickness. When I climbed to similar elevations in the Himalayas the only symptom I noticed was a need for more breaks. On the other hand, a couple of other trekkers who looked far more fit than I was got very sick and had to descend.

The princess hoped to get a certificate of achievement for scaling the mountain. Only three of her party made it to Uhuru Point and got the certificate. She said that she enjoyed her trip to Tanzania and would try to climb the mountain again.

[Photo courtesy Muhammad Mahdi Karim]

Tourists Amazed By Serengeti Wildebeest Calving

by Sean McLachlan on


February is a special time on the Serengeti. Right now its population of some 1.5 million wildebeests are giving birth to an estimated 8,000 calves a day, the Tanzania Daily News reports.

The East African nation has seen some 16,500 tourists come to watch the event in Serengeti National Park, including 5,800 domestic visitors who are part of a growing African middle class that’s boosting tourism across the continent.

This mass calving happens every year. All the pregnant wildebeests give birth within the same period of a few weeks, a process called “synchronized calving.” The animals give birth while standing up or even moving around, and wildebeest calves are walking within a couple of minutes. Once all the pregnant wildebeest have calved, the whole herd heads out.

These adaptations help protect the calves from predators. You can bet that hyenas, lions and other sharp-toothed critters are flocking to the area along with the tourists. Wildebeests are also hunted by humans to make a kind of jerky called biltong. This is legal in some parts of Africa although, of course, not in the park. One Tanzanian scientist estimated that half the calves will get eaten or die from other causes during the wildebeest’s 600-mile migration.

[Photo courtesy user zheem via Flickr]