Every slide should contain exactly one thesis. If you are explaining Jupiter’s moons, do not also explain sunspots on the same slide. Use animated builds: first show the geocentric model failing, then click to show Galileo’s solution.

Galileo Galilei was not a god. He was vain, ambitious, politically clumsy, and occasionally wrong (he rejected Kepler’s elliptical orbits). But his fatal flaw—stubborn, relentless curiosity—is exactly what we need to celebrate.