An arched fossilized foot bone found in Ethiopia shows that human ancestors walked upright 3.2 million years ago and were no longer tree dwellers, said a study Thursday in the journal Science.

The bone belongs to a cohort of the famed hominid Lucy, whose species Australopithecus afarensis roamed eastern Africa, and is the first evidence to address the question of how they got around.

Green is the new black at an environmentally minded New York design school at the start of Autumn-Winter Fashion Week.

Students at the Parsons The New School for Design have come up with "zero waste" fashion, a pun on the controversial popularity on catwalks of skeletal, zero-size models.

President Mahmoud Ahmadinejad said Friday that the Middle East will soon be free of the United States and Israel, as massive crowds of Iranians chanted pro-Egypt and anti-American slogans while marking the 32nd anniversary of the Islamic revolution.

Ahmadinejad warned Egyptians to be "watchful of the friendly face" of the United States.

Scuffles and a fistfight erupted between allies and adversaries of President Hugo Chavez in Venezuela's National Assembly on Thursday, forcing security guards to separate two battling lawmakers.

It was the second scuffle among lawmakers since early January, when newly elected opposition lawmakers took their seats in a legislature that had for years been controlled almost exclusively by Chavez allies.

Bristling with impatience, President Barack Obama on Thursday openly and sharply questioned whether Egyptian President Hosni Mubarak's pledge to shift power to his vice president is an "immediate, meaningful or sufficient" sign of reform for a country in upheaval.

Without naming Mubarak, Obama issued a written statement that criticized the leader for not offering clarity to his people or a concrete path to democracy. He called on Egyptian government leaders to do so, declaring: "They have not yet seized that opportunity."

Israel has failed to notify U.N. peacekeepers along the volatile Lebanese-Israeli border of its decision to freeze its plan to withdraw from the disputed village of Ghajar, a U.N. official said Thursday.

"The U.N. Interim Force in Lebanon (UNIFIL) has not been notified by Israel of any change in their position on this matter," said Milos Strugar, UNIFIL's director of political and civil affairs.

Egypt's Vice President Omar Suleiman on Thursday told protesters and strikers to head home or back to work in his first speech after Hosni Mubarak delegated presidential powers to him.

Suleiman told "the youth of Egypt, its heroes, go home and go back to your jobs" in a televised statement shortly after Mubarak made an address formally putting his former intelligence chief in charge of government business.

Egypt's embattled President Hosni Mubarak announced Thursday he was handing his powers over to his vice president, Omar Suleiman, and ordered constitutional amendments.

But the move means he retains his title of president and ensures regime control over the reform process, falling short of protester demands.

U.S. President Barack Obama declared Thursday the world was watching history unfold and a moment of transformation in Egypt, as reports said President Hosni Mubarak may be ready to step down.

Obama also directly addressed the young people of Egypt who have swelled massive crowds in Cairo, saying America would do all it could to ensure a genuine transition to democracy at an apparently pivotal moment of the crisis.

The U.S. has accused the Beirut-based Lebanese Canadian Bank of laundering money for alleged cocaine trafficker Ayman Joumaa, and linked Hizbullah to the bank's illegal activities.

The U.S. Treasury said it would move to prohibit U.S. financial institutions from working with the bank, which it said was tied to Joumaa's international syndicate that laundered "hundreds of millions of dollars monthly" in cash from the drugs trade.