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Stars form within the densest parts of dusty, gaseous regions within the interstellar matter. If enough gas is assembled in dense regions, they could collapse under their own weight and new stars form. However, molecular clouds are subject to random, chaotic motions and especially magnetic fields. Similar to strong thermal pressure, those magnetic fields should prevent such collapse and inhibit the formation of stars. For almost 60 years, the commonly accepted solution to this problem is the 'ambipolar diffusion' drift: Neutral gas, which makes up a large fraction of the interstellar matter, can slip relative to the magnetic fields and hence initiate the collapse of dense clumps. Recently, this issue has been revisited by researchers from the...