Stewart Brand and partners are building a 10,000-year clock, and within 25 years he hopes to catalog every life form on earth. That's anywhere from 10 to 100 million life forms, and only 1.6 million have been identified so far. Clearly someone who adopts lofty and time-intensive projects that he himself deems "mad," is worth checking out. Brand will be holding a rare lecture, "What Information Wants," to share his most recent thoughts on the nature of information in a social context. Brand has written several critically acclaimed books, including The Clock of the Long Now (which refers to the aforementioned clock) and How Buildings Learn: What Happens After They're Built (to change the practice of building and the use of buildings). The clock, which he calls "the world's slowest computer," is Brand's way of exploring long-term thinking and theories about the arrival and expectation of the future. Brand also founded the WELL (Whole Earth 'Lectronic Link), an early internet service provider and discussion medium (www.well.com). Check out Brand for free on Saturday, April 19, at 8 p.m. in the Richard White Auditorium on Duke's East Campus. And visit www.duke.edu/web/film/directions/Direast.html for directions.