[ He pulls the book closer for a moment, squinting at the page. Potassium wasn't isolated until way after his time so he really has no idea what he's reading. When Ema brings the soda over though he drops the book back onto the table, almost jumping. ]

Sorry, it was just... open.

[ He reaches for the bottle of soda, swirls it a little. ]

It's cold? Most of the drinks I've tried have been different types of tea. I had no idea there were so many.