"Never," he responded, eyes wide and innocent. "I'm glad you're not cross, Rose got all weird about it- that's who I licked, I licked Rose. She was wearing her mum's scent. I didn't much like it. And then I licked her and she didn't like that. I didn't mean anything; sometimes I just think better with my mouth."
He flushed, suddenly, eyes somehow going even wider. "And I don't mean that in the way it probably sounded. Besides, how else am I supposed to tell the chemical composition of something? Well, I could use the sonic screwdriver, I suppose. Or if I had access to a lab, or baring that to some electrical equipment- I once built a mini DNA scan out of supplies I found in the back storeroom of a rundown theater in London 1930, and I'm glad I did because it turned out to be an artificially grown Dalek and that is one thing I never ever ever want to put in my mouth- but other than that, I'd be stuck. And sometimes you don't have time to take apart stage lighting fixtures. And, it's less interesting."
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He flushed, suddenly, eyes somehow going even wider. "And I don't mean that in the way it probably sounded. Besides, how else am I supposed to tell the chemical composition of something? Well, I could use the sonic screwdriver, I suppose. Or if I had access to a lab, or baring that to some electrical equipment- I once built a mini DNA scan out of supplies I found in the back storeroom of a rundown theater in London 1930, and I'm glad I did because it turned out to be an artificially grown Dalek and that is one thing I never ever ever want to put in my mouth- but other than that, I'd be stuck. And sometimes you don't have time to take apart stage lighting fixtures. And, it's less interesting."