Here’s what we’re working on for 4PM today…

The Big Story: American Idle As we learn more about the sophistication and story behind the al Qaeda bomb-maker, we’re also learning that the technology to discover it during screening already exists — but it’s sitting in a non-descript warehouse in Texas. The cost to taxpayers for the technology? $184 million. How do we balance the need for safety on airplanes with concerns about privacy, spending, and ineffective, expensive technology? We’ll hear from Kate Hanni (@katehanni), Founder/Spokesperson, FlyersRights.org and Evan Kohlmann (@inteltweet), our NBC Terrorism Analyst and Senior Partner at Flashpoint Global Partners.

The Wednesday Megapanel:  We’ll start off with last night’s primaries — Sen. Dick Lugar lost (as expected), and the fight for marriage equality failed in North Carolina.  We’ll take a look at the politics of the day with Imogen Lloyd Webber (@illoydwebber), Ari Berman (@ariberman) and Rob Cox (@rob1cox).  We’ll also hear from Rep. Brad Sherman (@bradsherman) on his legislation targeting Too Big to Fail institutions — we’ll ask him about it, and get his take on instituting capital requirements.

The Specialist:  Can we use evolutionary biology to explain everyday human behavior, from the desire to climb the ladder at work to the “7 year itch” in relationships?  We’ll talk to an expert who says that human behavior is nothing unique to us — we play the same games in our relationships that monkeys and apes did.  Dario Maestripieri, author of Games Primates Play: An Undercover Investigation of the Evolution and Economics of Human Relationships will be here. Maestripieri is a Professor at The University of Chicago, where he teaches and conducts research on the biological bases of social behavior in human and nonhuman primates.

AmeriCorps, the national job service program for recent grads, is on the chopping in the Ryan budget.  They want to cut it completely — yet service positions are often a great first job for recent grads, and a way for students to “give back” while they repay their student loans.  We’ll talk to Matthew Segal (@matthewourtime), Co-Founder and President of Our Time  (@ourtimeorg)

Finally, for today’s Daily Rant, Imogen Lloyd Webber (@illoydwebber) will tackle the new announcement from Vogue magazine that they will no longer use images of dangerously underweight or underage models. Imogen says it’s a positive step that a magazine like Vogue takes a leadership stand on another public health “catastrophe” in America: anorexia and bulimia.