What is Science really?

My students are having a very difficult time understanding why they need to know science and why it all matters to them.  Every day I seem to answer the age old question of "Why do I need to know this?"  My answer is always that you may not need to know that 6.02 E 23 molecules is equal to one mole, but you need the skills.  I feel like a broken record telling my students that they do need these problem solving skills to be successful in life.  What happens when you dye your hair and you forget the amount of time that you left the color on and you change you hair color to blue?  You need to know how to chemically change this hair color to the desired shade.  These are the important skills students need to learn!  Even others are asking -Why Science.