system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How come soda foams up differently when poured on ice cream?
gpt
Soda by itself has no proteins in it so the bubbles pop almost as soon as they are made.  When you pour the soda on ice cream it melts some of it and mixes with the cream.  The proteins in the cream increase the strength of each bubble causing them to last longer and so creating the "foam" that sticks around longer.