Buzz
Even though most of us despise them, insects are an essential part of life on Earth. They maintain the health of our planet’s ecosystems, and without them, the world would likely be unrecognizable.
But that’s not all: Insects have played a pivotal role in shaping the course of our civilization. From influencing wars to impacting politics, bugs (including insects, pathogens, and other similar creatures) have had a profound impact on the modern world.
10. Lice Played a Key Role in Stopping Napoleon’s Russian Campaign
The idea of invading Russia and suffering defeat has become somewhat of a joke over time. Since Russia was unified as an empire, few have had the audacity to try and conquer it, considering its immense size and freezing winters. However, not everyone had the foresight to understand this. Armies like Hitler’s Germany and Napoleon’s France learned this lesson the hard way.
While the Nazis were nearly destined to lose, stretched thin across too many fronts, France under Napoleon stood a real chance of success. Many believe that Napoleon’s defeat was due to the same factors that led to Hitler’s downfall, but some researchers argue that it wasn’t the cold that led to his failure, but rather the presence of insects.
A French study revealed that about a third of Napoleon’s army during the invasion fell victim to deadly diseases. Among the most lethal were trench fever and typhus, both spread by body lice. Had it not been for the devastating effects on morale and the significant loss of soldiers, the invasion’s outcome might have been very different.
9. The Louisiana Purchase
The United States has been a global powerhouse for so long that we often forget how challenging it was to unite the country. Even after gaining independence, much of the land we now call the US was controlled by different factions. Without the right circumstances aligning at the right time, maps of the United States could look very different today.
One of the key turning points was the Louisiana Purchase. Back in the early 1800s, a vast portion of North America, known as the Louisiana Territory, was under French control, led by Napoleon. He had no intention of relinquishing it and envisioned it as a flourishing French colony in the New World.
What shifted Napoleon’s stance was a devastating outbreak of yellow fever among his soldiers stationed in the Caribbean. The disease, transmitted by mosquitoes, was particularly lethal to the French, who lacked natural immunity. Yellow fever was responsible for killing 100 to 120 soldiers every day.
Napoleon’s inability to maintain control in the Caribbean due to the yellow fever outbreak led him to rethink his plans for the Louisiana Territory. In 1803, he decided to sell it to the US government for $15 million.
8. Disease Halted the Japanese March Toward British India
Japan's involvement in World War II is often discussed in terms of its military actions in the Pacific and Southeast Asia. However, one aspect that frequently gets overlooked is Japan’s push toward British India, and just how close Japan came to winning the war if not for a few key battles there.
In 1944, Japan had successfully surrounded two crucial cities in northeastern India: Kohima and Imphal. Had they captured these cities, Japan could have established strategic bases to launch further offensives against the British. However, the jungle proved to be a major obstacle.
Due to heavy casualties from diseases like malaria and dysentery in the region, Japan made the decision to retreat from both cities. Most of their forces were lost to illness during their withdrawal through Burma, and this defeat marked a significant turning point in the war in the East. The British also faced similar challenges with diseases, but they retained their strategic advantage, which ultimately helped them secure victory.
7. The Global Domination of Flowers
If you look around at the plants in your environment, you'll notice that many of them are flowering plants. They play a huge role in our food supply, were among the first sources of medicine, and served as inspiration for art in times of leisure. Without flowering plants, life on Earth would look drastically different.
The rise of flowering plants is one of biology’s greatest enigmas. Around 130 million years ago, conifers were the dominant plant species. Then, almost out of nowhere, flowers emerged and quickly spread across the Earth, aided by insects such as honeybees and butterflies.
Without pollination, flowering plants would never have been able to proliferate around the globe, which would have drastically changed the natural landscape we know today. It's not an exaggeration to say that insects played a pivotal role in making human civilization possible—or at least in shaping it as we know it.
6. The Spanish Flu Played a Role in Britain’s Hold on India
World War I is often remembered for its immense scale, but other significant events occurred at the same time. One such event was the Spanish flu, a pandemic that killed more people worldwide than both World Wars combined, in just a few years. The rapid spread of the disease was due to the flu virus, which traveled faster than typical viruses.
While World War I had a significant impact on many global events, one of the most notable effects was on British-ruled India. As the war progressed, Indian demands for independence became louder, especially due to the country’s involvement in the conflict. Mahatma Gandhi had plans for widespread protests and independence as soon as the war concluded, with Britain at its most vulnerable. During this period, the Spanish flu hit, and combined with a severe drought, it devastated much of India’s population, including Gandhi.
With Gandhi too frail to mount any opposition, the British were able to continue enforcing martial law (which had been implemented during the war) throughout India. This allowed them to suppress any potential uprisings and maintain control of the country for another thirty years.
Had Britain not maintained its stronghold in India, with its valuable military bases and income generation, the outcome of World War II could have been dramatically altered.
5. The Human Body Is More Microbes Than You Think
Most people assume the human body consists only of human cells, which seems reasonable. Some might be aware of bacteria in the gut, but since they don’t typically cause harm, we tend to overlook them.
Upon closer inspection, you’d realize that the number of microbes in the human body doesn’t just exceed what you imagined; they actually outnumber human cells. In fact, human cells make up only 43 percent of the body’s total cell count. Growing research on this subject reveals that the microbial diversity within us is far greater than we ever anticipated. From bacteria to fungi, these organisms inhabit our bodies.
However, this doesn’t mean you can start disregarding harmful organisms like stomach bugs. The microbes in our bodies live in a mutually beneficial relationship with us, unlike external pests that cause harm. While scientists understand that these microbes are beneficial in many ways, the exact reason for their overwhelming presence remains a mystery.
4. Bugs Gave Us the Colors We Know Today
We often take the colors around us for granted today, but for much of human history, replicating colors was impossible. Synthetic dyes were not available, and aside from the colors found in nature, artists and craftsmen struggled to create a full spectrum of hues. The answer to this problem? Bugs, of course.
Throughout history, insects such as wasps and parasites have played a significant role in dye production. Take the color red, for example. For a long time, the red pigments we had were dull and unimpressive, but that changed when we encountered Native Mesoamerican civilizations. They had been using a particular insect, the cochineal, to produce a vibrant, almost perfect shade of red that mirrored the color in nature.
Another difficult color to replicate was purple. Purple was sourced from the ancient city of Tyre, in present-day Lebanon, where it was derived from a type of mollusk native to the area. To make just one gram of Tyrian purple, over 9,000 of these mollusks were needed. This is why purple became the color of royalty, as it was so costly that only the elite could afford it.
3. Insects Were the First Creatures to Master Flight
Flying is one of the most remarkable evolutionary traits in the natural world. Although many creatures now have this ability, we often overlook its significance. The exact moment when animals first developed wings is still a mystery, and evolutionary biologists continue to explore this question.
Recent studies suggest that insects were the pioneers of flight. This adaptation emerged as a response to the growth of taller plants around 400 million years ago. Land plants began to flourish around the same time the first insect ancestors appeared. The most fascinating part is that insects only evolved flight once, and all subsequent flying species originated from that initial evolution.
2. Malaria Paved the Way for the United Kingdom as We Know It Today
Scotland may be part of the United Kingdom now, but it wasn’t always so. Back in the 17th century, Scotland was an independent kingdom with its own aspirations of colonizing the New World. In the 1690s, about 4,000 Scots arrived in the Americas, aiming to establish their own colonial empire. Unfortunately, they chose the wrong spot. They landed in what would eventually be recognized as one of the world’s most perilous jungles: the Darien Gap, part of present-day Panama.
The Darien Gap, essentially a malarial swamp, is infamous for its harsh and unforgiving terrain. The Scots had the right idea, as it was believed to be the key passage connecting the Pacific and Atlantic oceans. However, they fell short in their reconnaissance before setting off on the expedition.
Tragically, within just two years, half of the settlers perished due to mosquito-borne diseases like malaria and yellow fever. Scotland went bankrupt in its attempt to sustain the colony, and as a result, it led to Scotland’s union with England in 1707. If it hadn’t been for that failed colonization attempt and the deadly mosquitoes, history could have unfolded quite differently.
1. Insects Influence Evolution in Plants
The intricate relationship between insects and plants is crucial for maintaining the health of Earth’s ecosystems and sustaining life as we know it. If this bond were ever broken, it would lead to catastrophic consequences. Although scientists have studied this relationship extensively, we have yet to fully comprehend its complexity and far-reaching effects.
Research suggests that insects could be the primary force driving evolution in plants. A study published in *Science Daily* discovered that plants not exposed to insecticides quickly begin producing more toxins in their fruits.
In some cases, these evolutionary changes appeared within a single generation, indicating that plants don’t simply adapt to insect behavior—they evolve at an accelerated pace. Typically, evolution takes millennia, but with the help of insects, plants can evolve in just a few years. This provides strong evidence supporting the long-held belief that insects are the primary cause of the vast diversity of plant life on Earth.
