The new world’s smallest thermometer has created from DNA.

DNA thermometer that is 20,000x smaller than a human hair which programmable and created by The University of Montreal researchers.

It has been found in research that the DNA molecules that encode our genetic information can unfold when heated.

"In recent years, biochemists also discovered that biomolecules such as proteins or RNA (a molecule similar to DNA) are employed as nanothermometers in living organisms and report temperature variation by folding or unfolding," said senior author Alexis Vallee-Belisle.

The main advantage of using DNA is that its chemistry is simple and programmable.

"DNA is made from four different monomer molecules called nucleotides: nucleotide A binds weakly to nucleotide T, whereas nucleotide C binds strongly to nucleotide G," explained first author David Gareau. "Using these simple design rules we are able to create DNA structures that fold and unfold at a specifically desired temperature."