He held the device between thumb and index finger so she could see it better. "This is a sonic screwdriver. Ever since I made the first model, I've improved and updated its functionality. It scans for poisons, obviously, and analysis the elements in just about anything. It can perform medical scans and open electronic locks." There was more but he didn't feel like trying to list every function.
While she was talking about food, he looked at the chips in the recyclable cup. The Doctor hardly heard what she was saying about food, which was something he never though about much one way or another. Whether it was abundant, as it now seemed to be, or lacking. He had never faced deprivation to the point of starving; things always worked out. And he could control hunger pangs anyway.
He moved over to the table she chose, following slowly. The Doctor pulled a chair out and sat, stretching his long, lean legs in front of him. He looked up from the chips clasped close to his midsection, gazing at the soldier. Shepard, he felt sure, would be just as full of questions in any other situation too.