Today, Earth Day, I went down to Grant Park to join the estimated 40,000 people who showed up for the March for Science. And there were stars. Beaker! Many of the signs were equally clever. Some of them were pretty obviously political: Make America THINK again. Science is what makes America great. I've seen smarter cabinets at IKEA. Less invasions, more equations. Einstein was a refugee. You can't repeal and replace the laws of physics. Trump's team are like atoms - they make up everything. Don't frack with science. Twitler (Trump with Hitler mustache) Facts matter. Defiance for science. We're not resisters. We're transformers. Others were more about Earth Day: I'm with her (image of the globe). (Although come to think of it, that's political, too!) Keep the earth clean. It's not Uranus. May the forest be with you. Love yo mama (image of Earth). Still others were just funny: I don't think you understand the gravity o...