Scientific Method
I think that "Asteroids and Dinosaurs" is an example of science because it helps us to learn about the history of the natural world. Another thing that is necessary in scientific experiment is the use the scientific method. The  scientific method is not used as a series of set procedures but is instead a system for scientific experiments and can be done in any order and repeated as many times as necessary until substantial evidence has been found to either back up or disprove the hypothesis. Specific example of the use of the scientific method in "Asteroids and Dinosaurs" are that from the beginning Walter Alverez made a hypothesis (they constructed hypotheses) that the dinosaurs extinction was due to the KT boundary. Then he sets up an investigation (they designed an experiment to test their hypothesis) to test the amount of beryllium in the rock but he realizes that the beryllium in the clay would have decayed already. Alverez and the other scientists working with him then decide to test (just because they first idea didn't work doesn't mean that they should give up) the amount of iridium in the clay. Then they hypothesize (They constructed hypotheses for their next experiment) about how much iridium will be in the clay. Then they conducted the analysis (they test their hypothesis about the amount of iridium in the clay) and find three parts iridium per billion which was much larger than any of then what any of them hypothesized. Then Alverez does research (its important to do research) in order to find another site to do a test (they conduct another test to see if the iridium is present elsewhere and test the validity of their first experiment) on. At this site the results are the same and Alverez and his team conclude (drawing conclusions is part of the scientific method) that whatever happen was very widespread. After he finds this he ponders (they ask questions in order to form a solid hypothesis) what caused the high levels of iridium, and he finds that his discovery goes with the existing hypothesis (this time they connect their results with an existing hypothesis) of Wallace Tucker and Dale Russel. Building off of their hypothesis Walter Alverez's bother Luis realizes that in order to prove that a supernova had led to the extiction of the dinosaurs they must test (they conduct another experiment this time to test the supernova idea) for plutonium. The results from the experiment show that there was plutonium (thats the end of that . . . right?) but when they retest (gotta make sure the first one was legit) for the plutonium the results are negative and they realize that the first sample must have gotten contaminated. (back to the drawing board) They realize that this proves (they proved the hypothesis to be false) the supernova hypothesis incorrect. After proving that hypothesis false they form another hypothesis. (another hypothesis) Their hypothesis was that there could have been an asteroid that hit the Earth. They then ask questions (they asks question in order to form a solid hypothesis) about how this could have led to the extinction of the dinosaurs. After pondering this question Luis comes up with a new hypothesis (Luis to the rescue): the asteroid hitting the earth may have cause enough dust to encircle the Earth to cause the sun to be virtually invisible. The lack of sun would have also not allowed the plants to undergo photosynthesis and killing the plants and working its way up the food web. They publish thier hypothesis (publishing their finding and hypotheses can lead to the experimentation of other scientists) about the link between the asteroid and the dinosaur extinction which leads to an increase in the exploration of these fields. Scientists thought of ways to test if these to things were related. Some of ways they tested (now other scientists can have a turn) were to check the fossil record, record of debris, glass, shockwaves, and a crater. Scientists found many of these thing including a giant crater which was found off the Yucatan Peninsula. Science is an ongoing process and many other hypotheses (everyone can have different hypotheses and no hypothesis is wrong) about how the dinosaurs became extinct have been formed. Even though the hypothesis of the giant asteroid has been substantially backed by the results of scientific experiments, scientists are still unable to make a direct connection between the asteroid and the extinction of dinosaurs.The Scientific MethodOriginal "Asteroids and dinosaurs: Unexpected twists and an unfinished story"
Sources:
http://undsci.berkeley.edu/article/alvarez_01
http://www.sciencebuddies.org/mentoring/project_scientific_method.shtml