I would say camera it was invented by Ibn ul Haitham.
this can help you save time and get almost everything correct
The answer is Dregg did delightfully on his Antarctic test because ... he knew it cold! This puzzle is a play on words; when somebody is fully set for every answer on a test, they can be said to "know it cold." At the same time the Antarctic is recognized for being, in fact, very cold. So in this joke Dregg knew all the answers about the cold weather of the Antarctic.
The answer to this question is Expert testimony
Expert testimony refers to the testimony that is given by qualified individuals who dedicated their life within a specific field.
Other examples of an expert testimony would be quoting a world renowned programmer on the topic of online hacking
