The president announced the rally in a tweet.
Scientists and their supporters marched to protest what some called “an alarming trend toward discrediting scientific consensus and restricting scientific discovery."
The 11 candidates running to be France's next president have gone quiet as required by law a day ahead of the most important French vote in generations
Thousands of scientists and science enthusiasts took to the streets in Washington and around the world on Saturday to protest.
Scientists and their supporters marched to protest what some called “an alarming trend toward discrediting scientific consensus and restricting scientific discovery."
Details were still emerging, but it appeared to have been the single deadliest known attack on an Afghan military base since the war began.
The airlines said it is investigating the incident.
A witness said the attendant had taken a stroller from a woman traveling with two young children and had then nearly come to blows with another passenger. American quickly apologized.
Real estate interests have shown their lobbying prowess, and the president has embraced positions that would benefit developers and complicate changes.
Scientists, students and research advocates are rallying from the Brandenburg Gate to the Washington Monument on Earth Day
Members of the so-called collectives, or colectivos in Spanish, operate with impunity and will defend their besieged president at all costs, experts say.
A class in “verbal judo” offers a window on how flight crews are taught to defuse situations with naughty, uncooperative or tipsy passengers.
Quari Tayib was once known as the Taliban shadow governor of Takhar Province.
Turkish denials have long rested on the lack of documentary evidence. But a researcher says he has found a crucial telegram about the World War I-era atrocity.
American Airlines said it is investigating the incident.