Paul Pierce says the Boston Celtics had no reason to discuss their heartbreaking loss in Game 7 of the NBA finals last summer before they returned to Staples Center on Sunday.

With a spectacularly fluid performance on offense against the outclassed Lakers, Pierce and the Celtics showed some things just don't need to be said out loud.

World stock markets sank Monday as investors sought less risky investments amid anti-government riots in Egypt that are damaging the economy of the Arab world's most populous country and threaten to spread instability elsewhere in region.

Oil prices rose to near $90 a barrel as fears escalated that protests in the city of Suez at the mouth of the strategic waterway — a key route for oil tankers and cargo ships — could interrupt the flow of oil. In currencies, the dollar was higher against the yen but lower against the euro.

The United States started organizing Sunday the evacuation of its nationals from Egypt as an angry anti-government revolt raged into a sixth day amid increasing lawlessness and mass jail breaks.

"The U.S. embassy in Cairo informs U.S. citizens in Egypt who wish to depart that the department of state is making arrangements to provide transportation to safehaven locations in Europe," an embassy statement said, as other countries issued travel warnings and tourists scrambled for flights out.

Saudi King Abdullah has told U.S. President Barack Obama that there should be no bargaining on Egypt's stability and the security of its people, the Saudi press agency said Sunday.

SPA said that Obama phoned the king in Morocco, where he is recuperating from surgery, and that both leaders were not happy with the chaotic situation and looting.

Thousands of inmates escaped prisons across Egypt on Sunday, including at least one jail that housed Muslim militants northwest of Cairo, adding to the chaos engulfing the country as anti-government protests continue to demand the ouster of longtime authoritarian President Hosni Mubarak.

Security officials said the prisoners escaped overnight from four jails after starting fires and clashing with guards. The inmates were helped by gangs of armed men who attacked the prisons, firing at guards in gunbattles that lasted hours.

Modern humans may have left Africa thousands of years earlier than previously thought, turning right and heading across the Red Sea into Arabia rather than following the Nile to a northern exit, an international team of researchers says.

Stone tools discovered in the United Arab Emirates indicate the presence of modern humans between 100,000 and 125,000 years ago, the researchers report in Friday's edition of the journal Science.

Escalating protests in Egypt jarred world financial markets on Friday. Stocks fell while the dollar, Treasuries and gold rose as investors sought to reduce their exposure to risk.

The Egyptian government's response to widespread street protests unnerved investors. The military was deployed in an effort to quell the protests and the headquarters of the ruling party was on fire. Thousands of people defied a curfew, and Internet and cell phone service has been cut off.

An alcohol-detection prototype that uses automatic sensors to instantly gauge a driver's fitness to be on the road has the potential to save thousands of lives, but could be as long as a decade away from everyday use in cars, federal officials and researchers said Friday.

U.S. Transportation Secretary Ray LaHood visited QinetiQ North America, a Waltham, Mass.-based research and development facility, for the first public demonstration of systems that could measure whether a motorist has a blood alcohol content at or above the legal limit of .08 and — if so — prevent the vehicle from starting.

A bomb exploded inside a grocery store frequented by foreigners on Friday in Kabul, killing at least eight people and injuring others, police and eyewitnesses said.

Three foreigners and a child were among the dead, Kabul Police Chief Mohammad Ayub Salangi told reporters at the scene.

For those not acquainted with the phrase "yellow journalism," it refers to sensationalizing the news with overly dramatic headlines intended to grab readers and sell the most papers.

That's the subject of "What The Public Wants," a comedy by Arnold Bennett that satirizes tabloid journalism in 1906 London. The play opened Thursday night at the Mint Theater in a witty, well-acted production; director Matthew Arbour is faithful to the original material, which is clever and surprisingly contemporary more than a hundred years after Bennett wrote it.