Sommaire:

Identical charged macromolecules in a solvent may exhibit counterintuitive interactions, such as attractive behaviour in a certain parameter range. After a brief introduction, we will explain in simple terms the phenomenon, which occurs under strong coulombic couplings. We will next review its practical consequences and the controversies it has given rise to in the last 80 years. Recent progress allowing for an analytical description will
then be presented, together with open problems.

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