Anybody who was catapulted back in time to Ice Age Europe would stand a good chance of being intelligible to the locals by using words such as “I”, “who” and “thou” and the numbers “two”, “three” and “five”, the work suggests. Which reminds me of a friend I was with in Europe with. She'd learned German at highschool but the only phrase she could remember was, "Ich bin zwölf Jahre alt." 'I am twelve years old.' Given she was twenty-four, the phrase had limited use in Germany, she reported. It would, however, get you several free drinks. So, y'know, you should feel free to test that out.