DNA origami
We can now build lidded boxes that can be locked or unlocked with a key made of a short strand of DNA then use toothed gears to expel the contents of the box into the body.
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Didn’t realise this was a thing. Amazing.
A deeper look, great video here https://www.youtube.com/watch?v=Ek-FDPymyyg
The idea of folding DNA to create arbitrary two- and three-dimensional shapes at the nanoscale just blows my mind. Not sure who thought of it first but this idea and it’s future applications are going to go a long way. More info about it here.
In the 15 years since the technique was first reported the field has grown massively. Nature Video finds out how DNA origami works and what has been achieved so far. Watch this video from a while back.
Pretty much an unrelated link but I used these instructions to make our school kids a double helix for educational purposes.