Some science demonstrations are such classics that it's hard to improve upon them. Which is why it's unfortunate that not every high school, or even every college, has the equipment on hand to allow students to see important scientific principles demonstrated in dramatic, vivid and memorable ways. At least we live in the age of YouTube and now everyone can see roses shattered after a quick freeze in liquid nitrogen, students spinning on swivel chairs to demonstrate the principle of angular momentum, electrodes separating water into hydrogen and oxygen gasses, and this classic demo of laminar vs. turbulent flow (courtesy of the mechanical engineering students at Georgia Tech)...
Which can only be followed up with a demonstration of metabolic activity and kinetic energy
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