DECODING DNA

Which parent did you get most DNA from? 10 amazing facts about our genes

Image: Sangharsh Lohakare

Genetics can both fascinate and befuddle us with its complexity, but understanding its mechanisms just might be the key to deciphering the building blocks of our entire existence. From genes that are shared between different species to viruses that insert themselves into our DNA, here are 10 things you—likely—didn’t know about genetics and DNA.

Image: Ganapathy Kumar

We vastly underestimate the amount of DNA we carry around in our cells. If you were to unravel all the DNA molecules in your body and lay them end to end, they would stretch an astonishing 10 billion miles—enough to reach the moon and back over 40 thousand times! However, despite the vast amount of DNA in our bodies, if we were to gather and weigh all of it together, it would surprisingly amount to only around 8 ounces.

Image: Harshad Khandare

Surprisingly, humans share about 50% of their DNA with bananas! But this shouldn’t be too surprising given the fact that all life on Earth evolved from a single organism, roughly 3.5 billion years ago. Every living creature on our planet has the same type of DNA, undergoing almost identical processes in order to live and reproduce.

Image: Pedro Lastra

Certain species, like salamanders and starfish, possess remarkable regenerative abilities, allowing them to regrow lost limbs. Other species like axolotls or jellyfish can even go further, regenerating anything from parts of their brains to crucial internal organs, or even recovering from being cut in half! Understanding the genetic mechanisms behind this ability holds promise for regenerative medicine and even tissue engineering.

Image: Hillshire Farm

Surprisingly, we inherit slightly more DNA from our mother’s side. While everyone receives 50% of DNA from each parent, a small portion of mitochondrial DNA, which is passed down exclusively from mother to child, contributes to this imbalance. Mitochondrial DNA also allows for tracing the ancient relationships of human populations, and for this reason, it is extensively studied in anthropology and evolutionary biology.

Image: Pietro Jeng

Scientists have already successfully stored digital data within DNA molecules, and many believe the technique has potential as a long-term storage solution. Its vast storage capacity and durability make it very attractive to store digital information, but the technology is still in development.

Image: George Prentzas

DNA is sort of a blueprint that determines most of our traits and characteristics, but it is far from having the last say on how particular traits or genes will express themselves. Environmental factors can modify gene expression without changing the underlying DNA sequence, potentially impacting health and development. This is the reason that even identical twins have noticeable differences, like unique fingerprints.

Image: Transly Translation Agency

Studies have shown that certain environmental factors experienced by parents, like exposure to stress or traumatic events, can leave chemical marks on DNA that are passed down to offspring. This phenomenon is called transgenerational epigenetic inheritance, and though it seems to contradict some of the tenets of Darwinian ideas, it is now widely accepted as one of the many mechanisms of genetic inheritance in most living organisms.

Image: Fusion Medical Animation

Rare genetic mutations can give natural immunity to certain diseases. In time, if these genes can be distributed sufficiently within a given population this can even lead to collective immunity. For example, there is a genetic mutation called CCR5-delta 32 that provides natural immunity to the Human Immunodeficiency Virus (HIV) by altering the structure of a specific protein these viruses use to infect cells. Studying these unique phenomena can be promising for developing cures and more effective treatments.

Image: Sangharsh Lohakare

A significant portion of the human genome consists of non-coding DNA, often referred to as "junk" DNA because it does not code for proteins. However, recent research suggests that this non-coding DNA plays important roles in gene regulation and genome stability, challenging the notion of it being just 'junk'.

Image: Belinda Fewings

Horizontal gene transfer is a very weird phenomenon where genetic material is transferred between completely different species, bypassing traditional vertical inheritance from parent to offspring. Although the mechanism behind this process is poorly understood, scientists believe that it played a significant role in the evolution of many organisms. In fact, certain types of viruses force this to happen in order to encode themselves into the DNA of their hosts and reproduce.

Behind popular wisdom

12 common sayings that don’t mean what you think

Image: Alexandra Fuller

We hear them daily and rarely question their meaning, but many popular sayings come from surprising origins—or mean something entirely different than we think. Some of these discrepancies are rooted in history, others in mistranslation, and more than a few in good old-fashioned misunderstanding. Here are 12 familiar phrases decoded and laid bare with real facts.

Image: César Couto

The original version, a 12th-century German proverb—_"The blood of the covenant is thicker than the water of the womb"_—suggests chosen bonds (like friendship or military brotherhood) are stronger than family ties, the opposite of how it’s used today. This shift in meaning likely occurred in later times, as the abbreviated form entered popular speech.

Image: Thiago Santos

The full phrase is "Great minds think alike… and fools seldom differ." With the full version, the meaning turns ironic—it suggests that both geniuses and fools can agree just as easily, likely a warning against groupthink.

Image: Bing Frost

This proverb is often used to warn against dangerous inquisitiveness, but the full version—_"Curiosity killed the cat, but satisfaction brought it back"_—adds nuance. It suggests that the reward of knowing can outweigh the risks of curiosity.

Image: Erik Mclean

The full phrase is "Jack of all trades, master of none, but oftentimes better than master of one." Originally, it praised versatility, not criticized it. The missing line completely flips the meaning, suggesting it’s often better to be well-rounded than narrowly skilled.

Image: T S

This phrase meant an impossible task—just like lifting yourself by your own shoelaces. First recorded in the 1800s, it mocked absurd self-starting efforts. But by the 20th century, American individualism had flipped its meaning into a motivational mantra.

Image: Felippe Lopes

The original phrase is "The proof of the pudding is in the eating," meaning you have to try something to know if it’s good. The modern shorthand makes little sense by itself and loses clarity but still hints at the original idea: results matter more than appearances.

Image: Luís Perdigão

There are competing theories about this phrase’s origin. The most common links it to boxing radio commentary, where a losing fighter is "saved by the bell" at the end of a round. Others trace it to 18th-century burial customs, when the fear of being buried alive led to coffins being rigged with strings tied to bells aboveground.

Image: Rowen Smith

A popular myth claims the phrase "rule of thumb" stems from a law allowing men to beat their wives with sticks no thicker than a thumb. Fortunately, no such law ever existed. The phrase dates back to the 17th century and likely originated in trades where measurements were estimated using the thumb’s width or length.

Image: Claudio Schwarz

One theory about the origin of "cold turkey" links it to the clammy, pale skin that some people experience during withdrawal, said to resemble cold turkey meat. However, a more likely explanation is that it combines the earlier idiom "talking turkey" (meaning to speak plainly) with "cold," used to describe something abrupt or blunt.

Image: Greg Pappas

This phrase isn’t about feeling cozy—it refers to rope-strung beds from the 18th century. Back then, mattresses rested on a web of ropes that needed regular tightening. "Tight" meant the ropes were pulled firm to prevent the mattress from sagging.

Image: Michael D

Though it sounds mythological, this phrase comes from early 1700s theater. Playwright John Dennis invented a new thunder sound effect for his play. After the show flopped, another theater used the effect without credit. Dennis famously complained, "They will not let my play run, but they steal my thunder."

Image: NOAA

Before modern transportation, trade ships often got stuck in winter ice. So, smaller vessels were sent to break the ice and clear a path. Used since at least the 16th century, the original nautical context made it a natural metaphor for overcoming barriers.