Imagine being asked to solve a maths problem.
You reach for your calculator. Dead battery! Your laptop? Not charged either.
Just as you’re about to grab a pen and paper, someone hands you a tiny tube of liquid.
“Here, try this instead!”
You stare at it.
“What am I supposed to do? Wash away my maths problem?” 🤨
Well, what if those few drops contained DNA capable of performing calculations?
Sounds like science fiction, doesn’t it?
Yet researchers at Maynooth University in Ireland have demonstrated something remarkably close — a computer made from DNA!
And the most fascinating part isn’t just what it calculates, but how it arrives at an answer.
Let’s find out!
How Can DNA Do Maths?
We know DNA carries information about living things. But what if it could also help solve maths problems?
That’s what these researchers explored, using tiny strands of DNA that can stick together and come apart.
Imagine a puzzle board with numbered spaces. Each space has several pieces to choose from, but neighbouring pieces must also match.
A piece might fit its space but not its neighbour. So it comes loose, allowing another piece to take its place.
The DNA strands behave somewhat similarly. They keep attaching and separating, with better-matching arrangements being favoured.
And here’s the clever part: the researchers designed the pieces so that the arrangement they naturally settle into represents the answer to a calculation!
So, Where Does the Maths Happen?
Let’s take an example from the study: 10 + 3 = 13.
First, the researchers converted the numbers into 0s and 1s. They then chose DNA strands designed to follow the rules of addition, including carrying a 1 to the next position when needed.
Once mixed and heated, then cooled, the strands began attaching to a longer DNA strand.
But here’s the catch! Not every piece matched its neighbours.
Poorly matched pieces could come loose and be replaced. Since the strands were designed around the rules of addition, the correctly matched arrangement represented 13.
How did they check?
Using special markers that glow differently depending on the DNA arrangement, the researchers could read the answer as 0s and 1s.
The trick isn’t that DNA knows maths. It’s that the maths was built into how the DNA pieces fit together!
What’s So Special About It?
Unlike ordinary computers, this DNA computer doesn’t need a continuous supply of electricity to carry out its molecular calculations.
And there’s more!
- Fewer corrections: Its design favours the right arrangement, reducing the need for separate error-correction steps.
- Reusable: Researchers demonstrated that the same system could handle new inputs repeatedly.
- Versatile: It performed addition, multiplication, division and other simple computing tasks.
In the future, such methods might help with storing information in DNA or building tiny structures that follow programmed instructions.
So, What’s the Catch?
Well, don’t retire your laptop just yet! 😏
The system still needs carefully prepared DNA, heating and cooling, and laboratory equipment to read the results.
And while some small calculations took less than a minute, larger ones could take hours. Accuracy also became harder to maintain as the system grew.
So, although promising, this remains an experimental approach rather than a practical replacement for everyday computers.
A Little Food for Thought!
If DNA can perform calculations using its natural ability to form connections, could other materials do something similar?
And if computers don’t always need electronic circuits to process information, what other forms might computing take in the future?
And what about security? Electronic computers can sometimes reveal information through their power use or processing time. Could DNA computers have their own weaknesses, perhaps through the time they take or the physical signals they produce?
Could unwanted chemical reactions also affect their answers?
And finally, how practical might such computers become outside a laboratory?
There’s certainly more to explore beyond the familiar world of chips and circuits!
Perhaps the bigger question is: how practical could such approaches become beyond carefully controlled laboratories?
Final Thoughts
This research reminds us that computing isn’t necessarily about chips, screens or keyboards.
It’s about processing information according to rules.
And sometimes, those rules can be built into something as tiny as a strand of DNA!
Who knew a molecule famous for carrying life’s instructions could also have a knack for maths? 😎