Dr. Dan Killam on Nostr: Imagine you have a foot that secretes acid, which you use to dissolve away solid rock ...

Imagine you have a foot that secretes acid, which you use to dissolve away solid rock to make a burrow. Now imagine some scientists want to prove you do this. They put some pH-sensing foil under you and really hope you'll cooperate and leave your footprint on it. You chuckle and do so, leaving a funny smooch-shaped impression on the foil. This is how it was proven that the boring giant clam uses acid to make its burrow, decreasing local pH by ~2 units! #clamFacts