And when we have two light charges in close proximity, they will create a repulsive force. And so the only type of electric force, the only type of intermolecular force that tends to separate these single strands are these negative charges on these adjacent phosphate groups. So the negatively charged phosphate groups lead to electric repulsive forces. Now normally under room temperature or in body temperature, at body temperature, these attractive forces overpower these repulsive forces. And so that's exactly why the double helix structure remains. Now let's move on to the reaction solvent.