Sitara Nieves

Alzheimer's disease affects millions of people worldwide; it's often a disease that is undetectable until it's too late. However, a new set of national guidelines are being released that will help catch signs of the disease earlier. David Shenk, author of "The Forgetting: Alzheimer's, Portrait of an Epidemic," explains the latest guidelines.

In recent days, harrowing reports out of Misrata, Libya's third largest city, have brought into sharp relief the dangers for civilians living there. Thousands of migrant workers are trapped as rebels spar with Moammar Gadhafi's forces, and scores of foreign medical workers have already departed or plan to soon. Some civilians have been evacuated during nightfall, but the situation there remains dire. Iman recently escaped Misrata by boat with her baby and husband and is now in Ireland; she shares her story.

The United Nations has reached an agreement with Libyan leader Moammar Gadhafi on providing humanitarian aid to the country. The agreement also includes setting up a aid corridor to Misurata, which has been under siege for the past 50 days. The New York Times' Rod Nordland reports on the latest from Benghazi.

A new study has traced the origins of language to ancient South Africa, implying that there's one starting place for modern language. So what were the first words? Likely simple verbs and nouns that reflected the immediate needs of the population, says Mark Pagel, professor of evolutionary biology at the University of Reading in England. He's a former professor and advisor to the author of the study, Quentin Atkinson.

"Wretches and Jabberers" is a buddy movie, a road trip movie and a moving adventure. But this new film is different than your typical mainstream fare. The documentary stars two autistic friends and advocates who do most of their communicating through typing. The story follows Larry Bissonnette and Tracy Thresher, as well as their assistants Pascal Cheng and Harvey Lavoy, as they travel around the world, meet other autistic people, and advocate for autism rights.

On the the fourth day of air assaults against Libyan air defenses, Col. Gadhafi's forces continued to bombard of the city of Misurata. We get a live update from the Eastern Libyan city with Saadon al-Misuraty, a Libyan opposition leader in the besieged town.

Musa Ibrahim, Libyan government spokesperson says that there is no evidence that Col. Gadhafi is using air strikes on his own people. Instead, he says he welcomes the United Nations to Libya for a fact finding mission into his country. He says that there are millions of people who support Gadhafi. "Col. Gadhafi is leading the country forward to a new constitution, freedom of the press, and better salaries for people," he says. Without him, the country will see chaos.

The crowd is good natured in Tahrir Square as labor strikers, who want higher wages and more economic security, have joined the protesters. The BBC's Paul Adams is in Tahrir Square, where he says he sees a confluence between the demands for a more secure Egypt and the desire to bring down the Mubarak regime.

Google executive Wael Ghonim was released yesterday from Egyptian prison. It turns out that he was one of the main forces behind the Facebook and YouTube campaigns that helped drive the protests in Cairo. However, in an emotional interview, Ghonim told an Egyptian television station: "I'm not a hero. the real heroes are the youth who are behind this revolution. By God's will, we are going to clean this country of this rubbish.”

Violence broke out in Tahrir Square between pro-Mubarak and pro-Democracy demonstrators, rattling Egypt. There are reports that this violence was choreographed by Mubarak, who paid demonstraters to clash with pro-Democracy protestors. However, some are legitimately saying that the protests should end and Mubarak should be respected enough to stay in power until he steps down.

Columnist for The New York Times, Nicholas Kristof reports live from Cairo's Tahrir Square, where pro and anti-government clashes are turning violent again. Egyptian soldiers had been separating the two sides, but are now letting the protesters advance. Gunshots have been heard.

The Egyptian army has stepped in to protect pro-Democracy demonstrators in Tahrir Square after a day of violence. The New York Times columnist, Nicholas Kristof has been reporting from the square, where he was wary of the organized and aggressive pro-Mubarak demonstrators as soon as they showed up. He brings us the latest from the scene.

Clashes have broken out in Cairo's Tahrir Square between Pro-democracy and Pro-Mubarak demonstrators. The pro-Mubarak supporters that have taken to the streets are "incredibly aggressive" says New York Times columnist, Nicholas Kristof. There are questions as to whether they were organized and sent into the streets to incite violence.

Jordan's King Abdullah has sacked his government following protests as thousands marched in Amman to protest rising prices and unemployment and to demand that the prime minister, Samir Rifai step down. Prince Hassan of Jordan reacts to the news and talks about the future of the Mideast and the view of Egypt from Jordan. Shibley Telhami, Anwar Sadat Professor for Peace and Development at the University of Maryland also weighs in.

It's been almost two weeks since Tunisia's ousted President Zine al-Abidine Ben Ali and his family fled the country in the face of massive street rallies. The anti-government protest have continued in Tunisia and the country has issued an international arrest warrant for the former president. U.S. ambassador to Tunisia, Gordon Gray explains the roots of the current situation and how it could change in the near future.

Three people died in Tuesday's protests that swept through the streets of Cairo, Egypt. Protesters called for the end to the 30-year authoritarian rule of President Mubarak. "We're waiting for some kind of revolution or something like that. We have to move, we're not going to stand still," one protester told the BBC.

Protesters have taken to the streets of Cairo with demands on a range of issues from ending police brutality to raising the minimum wage. Activists organized protests over Facebook and Twitter. But while the city is galvanized by the recent events in nearby Tunisia, will this uprising enact change? The BBC's Jon Leyne reports from Cairo on the protests. 

Weeks of protests have changed Tunisia forever. The 23-year rule of President Zine al-Abidene Ben Ali ended as he left the country and his government, fleeing to Saudi Arabia. Life in the capital, Tunis, was disrupted by gun battles between the Tunisian army and militia still loyal to Ben Ali. However, daily life is now returning to normal. Renee Rutta is a New Yorker who has been living in Tunis with her family for almost a year. She says she will stay as long as she feels safe.

The month-long uprising that brought an abrupt end to the 23-year rule of Tunisia's President Ben Ali on Friday is still reeling from its own force. Even as the interim government called for democratic elections in the upcoming months, sniper fire from what were thought to be renegade police militia battling the military could be heard on Sunday in pockets of the capital Tunis. Protesters hope there will be enough time for fledgling opposition groups to become a power to be reckoned with, but skeptics are fearful that elections could open the doors of Tunisia's modern secular society to more fundamentalist Islamic groups as well.

Saturday's shooting in Tucson has led gun control advocates to begin drafting bills to strenghten gun control laws. Meanwhile, gun sales have been up since the shooting. While the issue of gun control tends to come to the fore following tragedies of this sort, few actually think that any real legislative change will come in the wake of the shooting.