article_snippet.sent: The top-secret weapons lab may look like inventions straight out of a sci-fi film, but this collection of designs were very much real and developed in a top-secret British war lab more than 70 years ago.
highlights_snippet.sent: The top-secret weapons lab developed some groundbreaking weapons .
  
highlights_snippet.sent: The top-secret weapons lab included the human limpet mine and a rocket-powered wheel .