A hundred go in.
One comes out.
A cell has swallowed a lipid nanoparticle. But what has been swallowed is not yet inside the cell — one membrane still stands in the way.
Only 1–2% of the mRNA that goes in ever gets through that membrane; the rest is cut up in the lysosome. These 20 lessons follow those one or two out, molecule by molecule — polyelectrolyte complexes, pKa and apparent pKa, endosome formation and maturation, BMP ion pairs, cones and the hexagonal II phase. Python runs right inside this page.
How you'll learn
The whole course covers thirty minutes — from being swallowed to the membrane bursting. Twenty lessons inside that window.
Why mRNA and lipid stick together by themselves, and why one pH value flips that three times — from physical chemistry up to the cell.
Two magnets sticking together do not shatter. The ion pair has to become a cone before the sheet folds. That is the spine of this course.
The proton-sponge hypothesis is unsettled. You learn not which side is right, but what experiment would tell them apart.