Book off an hour or so at 3 p.m. ET this coming Tuesday, April 28, to join, via webcast, the "sneak preview" of the grandly named Wolfram/Alpha Computational Knowledge Engine at Harvard's Berkman Center. As we told you last month in One to Watch?, Wolfram, a mathematician, has kept wraps around his project while talking up its potential in general terms. Will it be a search engine? Will it be an answering tool? Will it be so much more? Now you can tune in as Stephen Wolfram and Jonathan Zittrain, law prof at Harvard expose some of the mystery. You can send in your questions via @ reply/DM @BerkmanCenter on Twitter, or join the IRC.