We get a closer look at the Tea Party with Janet Elder, editor of news surveys and election analysis for The New York Times, and bring you this morning's headlines.

Today is tax day. (So go mail in your paperwork or file for an automatic extension, folks.) It's no surprise that today is the day Tea Party activists have chosen to rally, across the country, against what they call, unnecessary government largess. There will be hundreds of small rallies in cities from Walla Walla, Wash. to Niceville, Fla. They are all loosely related to the Tea Party Express, which arrives in Washington, D.C. at 11:00 a.m., revved up after a speech from Sarah Palin in Boston yesterday.

• TAXES TAKEOUT:  Today is tax day. And while it may seem like a tedious process that takes money out of our pockets, taxes may say more about us - and the prior year of our lives - than we think. Alan Dlugash, a tax partner at Paneth and Shrone explains how taxes can become the diary of our lives.
• LISTENERS TAKEOUT:  After a conversation yesterday with Oklahoma State Sen. Randy Brogdan, listeners - especially those from Oklahoma - respond to the idea of creating a state militia. 

President Obama is in Cape Canaveral, Fla. today, where he'll defend his controversial vision for NASA. The linchpin of Obama's plan involves cancelling the Constellation program and reviving the Orion project. Axing Constellation will effectively prohibit NASA from returning astronauts to the moon - a prospect that lead iconic astronauts Neil Armstrong and James Lovell to publicly express dismay, calling Obama's plan "devastating." 

Stunning numbers released today show that China's GDP has seen almost twelve percent growth, while inflation remained low. Domestic spending accounted for much of this growth, which means that the Chinese government's stimulus package has gotten people to spend more money. At the same time, there is debate over China's manipulation of their currency, which has caused ripples throughout the international trade community.

A five-mile high plume of ash from an erupting volcano in Iceland is drifting across Northern Europe, causing massive disruption at airports in the U.K. and Scandinavia. All flights originating from Scotland have already been grounded, and all London flights will be suspended.

For this week's tech segment, we talk with esteemed graphic novelist James Sturm about his attempts to live without Web access.

Micah Weinberg, senior research fellow at the New America Foundation, joins us to talk about the changing role of the nurse practitioner; this morning's headlines.

The nation is facing a shortage of primary care doctors, and to fill that gap many states are proposing to expand the role of nurse practitioners to allow them to prescribe medication, practice without a doctor's supervision, and even be called doctors if they have a doctorate. 

• IMMIGRATION REFORM: In Arizona, state lawmakers approved some of the harshest anti-illegal-immigration measures ever. Mark Brodie, reporter and host at member station KJZZ joins us from Phoenix to discuss if these laws are tough measures for a tough problem or little more than legalized racial profiling. 
• WASHINGTON TAKEOUT:  Following the tragic mine explosion, which killed 29 miners and injured others in Montcoal, West Virginia, lawmakers on Capitol Hill are not taking the institutional inertia that lead to this tragedy lightly. Takeaway Washington correspondent Todd Zwillich explains.

Earlier this week social media darling, Twitter, announced a plan to make money through internally generated ad revenue, by displaying "promoted tweets" when people search Twitter.com. (Google returns sponsored links in much the same way.) People have wondered for years how Twitter planned to make money, so the announcement made some waves. However, more historic news came yesterday, when the Library of Congress announced it would begin the process of archiving all the public tweets ever tweeted, going back to Twitter's inception in 2006.  

Yesterday's earthquake in the Chinese region of Yushu has left over six hundred people dead and thousands wounded. We hear from Jamin, an American tour guide who tells us what the country needs most, including winter supplies, tents, and machinery to help dig out those who are still stuck under the rubble. He also notes that the rescue efforts kicked into gear almost immediately following the quake.

Researchers at the University of Michigan looked at whether people really get wiser with age. We'll be talking about whether you think this holds true in your life and we want your input. Do you think you're wiser now than you were when you were young? And what is wisdom anyway?