Wil Wheaton isn’t here to make science cool. Science is already cool, and vitally important. He’s just here to remind people of that. Wheaton — who made his big debut in “Stand by Me,” made his mark in “Star Trek: The Next Generation” and now makes his living both as an actor (he plays an “evil” version of himself on “The Big Bang Theory”) and as a geek-about-town, speaking, blogging and hosting a gaming show on YouTube called “Tabletop” — will be appearing at this weekend’s fourth biennial USA Science and Engineering Festival. The event targets kids with Q-and-As featuring actual scientists, interactive demonstrations of the “don’t try this at home” variety, performances from They Might Be Giants and talks from other stars in the nerd universe. Read More…