Mussels use chemical primer to cement themselves to rocks
One part of glue molecule clears way for second part to glom on to surface
![Mussels](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/08/080715_bm_musselglue_free.jpg?fit=860%2C460&ssl=1)
STUCK Mussels may ready their water-soaked sticking spot with a chemical that wipes away grip-busting ions.
Jonathan Wilker