Young Egyptians are once again organizing on social media and taking to the streets of Cairo by the hundreds every Friday, not to protest injustice or clash with police, but to enjoy long runs through one of the world's most crowded and chaotic cities.

On a recent Friday morning around 300 young people gathered at a central square, a small fraction of the 2,500 that had signed up for the event on Facebook, but a reasonable showing for an event held at 7:00 a.m. on a weekend.

The Court of Arbitration for Sport has heard appeals by the Serbian and Albanian football federations challenging UEFA sanctions after their European Championship qualifier was abandoned.

A chaotic match in Belgrade last October was stopped before halftime then called off when a drone carrying an Albanian nationalist banner flew into the stadium.

An all-day Earth Day rally and concert is drawing some big names to the National Mall.

Usher, Mary J. Blige, Gwen Stefani, Common and Train are scheduled to perform Saturday during the free event hosted by will.i.am and Soledad O'Brien. The rally runs from 11 a.m. to 7 p.m. near the Washington Monument.

Breaking from decades of "Just Say No"-type messaging about marijuana use, Colorado law enforcement officials are starting a new campaign designed to promote safe marijuana use.

The revised campaign starts this weekend, when tens of thousands are expected at public rallies and concerts in observation of the 4/20 marijuana holiday. A few things to know about the new effort, along with some backstory:

Before the late Robin Williams enthralled television audiences on "Mork and Mindy," he was a star on the stand-up comedy circuit in the 1980s.

The political satirist Will Durst had the unenviable task of following the master when he debuted at the legendary stand-up comedy club Holy City Zoo in San Francisco, where Williams started his comedic career.

A new drug policy agency would focus as much on health as on policing under a proposal a New York City lawmaker introduced Thursday to shift how the nation's biggest city approaches illegal drug use.

The drug strategy office would advise city leaders on lowering drug-related deaths and disease along with crime. It also would coordinate answers to a problem that sometimes seems to pit one set of government objectives against another, supporters say.

The nation's poultry industry may have to live with a deadly bird flu strain for several years, which would be "devastating," the U.S. Department of Agriculture's chief veterinary officer said Thursday.

Dr. John Clifford also said that while new cases should drop to close to zero once the weather warms up and kills off the virus, there's "very likely" to be a resurgence this fall when the wild waterfowl that are natural carriers of avian influenza fly south for the winter.

After years of orbiting Mercury, NASA's Messenger spacecraft will crash into the planet at the end of this month.

NASA announced Messenger's impending demise Thursday. But instead of mourning, scientists and engineers celebrated the success of this first spacecraft to orbit the planet closest to our sun.

The NBA playoffs are about to being without some of the most recognizable players in the game.

The Los Angeles Lakers' Kobe Bryant and New York's Carmelo Anthony will miss the playoffs for the second straight year, and Oklahoma City's Kevin Durant and Miami's Dwyane Wade are also out.

China thrived at the Beijing Games in 2008. Britain excelled in London in 2012. Next year, Brazil will try to show it can produce a historic performance at its home Olympics.

The nation is working hard to make sure its athletes can be successful at the Rio de Janeiro Games in 2016, investing record amounts to get them ready to perform well in front of a home crowd.