Nature
A Journey of Hope. Content Warning.
Once upon a time, in a quaint coastal village named Oceantide, there lived a humble fisherman named Elias. His weathered hands and salt-encrusted boots told the story of a life intertwined with the sea. Oceantide had prospered for generations, its lifeblood being the bounty of the ocean. But, as the years passed, Elias noticed a change in the waters that troubled him deeply.
By Oshilim Anwuli First3 years ago in Earth
Do mosquitos actually bite some people more than others?
Some swear they’re cursed to be hunted by mosquitoes while their close-by companions are regularly left unscathed. But is this an illusion? If it's not, what's going on? And what can we do about it? It all comes down to how— and why— mosquitoes find us. While male mosquitoes stick to nectar for sustenance, females also seek out blood to provide the nutrients they need for their eggs. Different mosquito species evolved to feed on different animals. And, probably within the last 10,000 years, multiple mosquito lineages independently evolved a predilection for people. As human settlements became more permanent, they provided plenty of standing water, even through intense dry seasons, which supported mosquito reproduction year-round. Female mosquitoes are equipped with antennae covered in hair-like appendages that contain odor-sensing receptors and neurons. These pick up on the signals of their preferred hosts, And over thousands of years, the mosquitoes that target humans have gotten extremely good at tracking us down. They also target parts of our bodies where we’re less likely to notice them. And they’re sensitive to visual cues and changes in airflow, so when we try to defend ourselves, they can make swift escapes. They even learn to avoid particularly defensive people altogether. But before these close encounters happen, several factors alert mosquitoes to people's presence. Female mosquitoes can pick up on the carbon dioxide humans constantly exhale from about 10 meters away. Once they’ve gotten the CO2 cue, they become especially interested in dark, high-contrast objects and the hues found in human skin. As they follow the carbon dioxide plume to its source, they eventually sense body heat and odors. These smells are generated by the many microorganisms that live on our skin. They break down the secretions our bodies produce, like sweat and sebum. In doing so, our skin microbes create smaller organic compounds that can vaporize and get picked up as smells— smells that human-homing mosquitoes are especially attuned to. Getting extra sweaty can temporarily make people more attractive to mosquitoes— as can ingesting alcohol or being pregnant. And the Plasmodium parasite that causes malaria makes the people it infects more appealing to mosquitoes by increasing the amounts of certain fruit-smelling aldehyde compounds on their skin. This is extremely helpful to the parasite because it depends on both humans and mosquitoes to reproduce. But in addition to these temporary factors, about 20% of people are thought to be naturally high attractors, or mosquito magnets, who are disproportionately targeted year after year. If you’re one of them, you’re probably well aware. Sorry about that. Why this is seems to come down to some skin-specific characteristics. While carbon dioxide exhalations and body heat consistently signal the presence of warm-blooded animals, human body odor is more distinctive. And everyone hosts different microbial communities on their skin, which contribute to unique body odors that likewise vary from person to person. Researchers reveal that the receptors mosquitoes use to detect acidic compounds are especially important in helping them navigate towards humans. And, indeed, humans with more abundant skin acids prove to be consistently more attractive to mosquitoes. Because it’s such a persistent trait, certain genes may play a role, perhaps by helping determine the skin’s microbial composition. Scientists have observed that mosquitoes demonstrate similar levels of attraction among identical twins while responding more variably to fraternal twins, which supports that there may be some genetic basis at play. But beyond confirming that mosquitoes are, in fact, conspiring against some of us specifically, understanding what makes people mosquito-magnets has serious, large-scale implications. Every year, hundreds of thousands of people die from mosquito-borne diseases. And resources aren’t reaching those who need them most. This knowledge can help inspire solutions, like more effective insect repellents that manipulate the skin's microbiome and odors. And knowing that some people are especially strong mosquito attractors could also help efforts to get them resources like repellents, bed nets, vaccines, tests, and treatments. The results could not only be less itchy, they could break transmission cycles and save countless lives.
By Antonín Valda3 years ago in Earth
Why don’t we cover the desert with solar panels?
Every day, the sands of the Sahara Desert reach temperatures up to 80° Celsius. Stretching over roughly nine million square kilometers, this massive desert receives about 22 million terawatt hours of energy from the Sun every year. That’s well over 100 times more energy than humanity consumes annually. So, could covering the desert with solar panels solve our energy problems for good? Solar panels work when light particles hit their surface with enough energy to knock electrons out of their stable bonds. On their journey back to stability, these electrons produce electricity. However, there’s a limit to how much power panels can generate. Solar panels can only interact with certain wavelengths of light, making it impossible to convert over half the sunlight they receive. And even light particles they can convert often bounce off them without ever hitting an electron. But thanks to clever scientists and engineers and substantial government investment, solar panels are generating more electricity than ever. Anti-reflective coatings and patterns on the panels’ surface create more opportunities for incoming light particles to hit electrons. These techniques have increased commercial solar panel efficiency from the low-teens to 25%, with experimental models reaching up to 47%. What’s more, solar has gotten 89% cheaper over the last decade, thanks in part to global supply chains for other technologies that use the same materials. Together, these factors have made solar power the cheapest source of electricity on Earth. Countries including India, China, Egypt, and the US, have already taken these new panels into the desert. Their massive solar farms range from 15 to 56 square kilometers, and when the sun is high in the sky, these plants can provide energy for hundreds of thousands of local residents.But these farms also get extremely hot. Light that solar cells don’t convert or reflect is absorbed as heat, which reduces a panel’s efficiency. And the cooling systems employed by many farms can use huge amounts of energy powering fans or moving water to maintain optimal temperatures. Even with these systems, solar panels in the desert absorb far more heat than the natural sandy environment. This hasn’t been a problem on the scale of existing solar farms. But if we tried to cover the Sahara,this effect could create massive changes in the region's climate. Constructing solar farms already disrupts local ecosystems, but a plant of this scale could dramatically transform the desert landscape. Thankfully, solar panels aren’t our only option. And some of the largest solar plants in the world are trying a new approach: giant mirrors. Morocco’s Noor Power Plant, which will eventually cover roughly 30 square kilometers of the Sahara, is a concentrated solar power plant. This design reflects light onto a receiver, which converts that energy to heat, and then electricity. These mirrors still create a dangerous temperature shift for local wildlife, but they have less potential to transform the landscape. And since it takes time for the materials being heated to cool off, these plants often continue producing electricity past sunset. Whether they use panels or mirrors, industrial solar farms are often easy to fit into existing energy infrastructure. However, getting their electricity beyond local power grids is much more difficult. Some countries are working on ways to connect electric grids across the globe. And many farm store energy in massive batteries, or convert their electricity into clean gas that can be used later. But right now, these techniques are still too expensive and inefficient to rely on. Worse still, industrial renewables can share some of the same problems as fossil fuels,relying on destructive mining operations and carbon-emitting global supply chains. Fortunately, solar can exist on many scales, from industrial solar farms to smaller installations that power individual buildings and rural communities. These projects can supplement energy use or provide a passive source of energy for regions off the grid. And since solar panels rely on a few simple components, they’re quick to install and relatively easy to update. In fact, it’s this flexibility that enabled solar to become so cheap and ubiquitous over the last decade. So if we want to keep up with humanity's rising energy use, we'll need answers both big and small.
By Antonín Valda3 years ago in Earth
Shores of Transformation
The coastline of Serenitas was a marvel of nature’s beauty, a delicate balance between land and sea. The rhythmic whispers of the ocean waves were a constant companion to the villagers, a reminder of their symbiotic relationship with the vast expanse of water. For generations, the beach had been a vital part of their lives, providing sustenance, livelihood, and a sanctuary of tranquility.
By Ezuma calista3 years ago in Earth
Beauty of heaven
Heaven, the celestial place that is frequently represented in different theological and mythical traditions, has long attracted people's attention. Heaven's beauty continues to be a source of intrigue and inspiration, regardless of whether one thinks of it as a real place or a metaphor for an ideal life. In order to shed light on this magical place, we shall study the ageless beauty of heaven in this article using many cultural and creative perspectives. A Heavenly Landscape
By Misha story writer3 years ago in Earth
Imagining a Sky Full of Planets: If the Moon Were Replaced
Title: Imagining a Sky Full of Planets: If the Moon Were Replaced Introduction The Moon, Earth's celestial companion, has been a constant presence in our night sky for as long as humanity has existed. Its beauty and gravitational influence have shaped our planet and culture. But what if, hypothetically, the Moon were replaced by other planets from our solar system? In this imaginative exploration, we will contemplate the fascinating consequences of such a scenario, from altered tides to the transformation of Earth's nightscape.
By Pravin choudhary 3 years ago in Earth
The Unthinkable Dream: Landing on the Sun
Title: The Unthinkable Dream: Landing on the Sun Introduction: The idea of landing on the Sun, Earth's life-sustaining celestial neighbor, is a concept that piques the imagination and curiosity of science enthusiasts and dreamers alike. However, while the notion of journeying to the heart of our solar system's most prominent star is undeniably captivating, it is important to recognize that landing on the Sun remains a fantastical dream rather than a scientific endeavor on the horizon. In this article, we delve into the myriad of reasons why landing on the Sun remains a challenge that transcends the boundaries of current human capabilities.
By Pravin choudhary 3 years ago in Earth
What If All Planets Were Earth-Sized?
Title: What If All Planets Were Earth-Sized? Introduction: The universe is a vast and mysterious expanse, filled with celestial bodies of all shapes and sizes. Among these, Earth stands as a unique gem, known for its diverse ecosystems and ability to support life. But what if all planets in our universe were Earth-sized? How would this hypothetical scenario impact the cosmos and our understanding of the universe? In this article, we embark on a journey of imagination to explore the possibilities and implications of a universe where every planet is Earth-sized.
By Pravin choudhary 3 years ago in Earth
