This 3D-Printed Tugboat Is Smaller Than a Human Hair, But It Represents So Much More – ScienceAlert

Imagine, if you will, a microscopic submarine, motoring around inside your blood vessels, delivering medicine, or perhaps performing surgery all on its own.
This is the sort of future theoretical physicist Richard Feynman used to fantasise about, and yet today, we’re still stuck on the swimming part.
For a vessel at such a tiny scale, the fluid in our blood vessels practically feels like molasses. Recreating a microswimmer with powers akin to those of sperm or bacteria powerful enough to push through…

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