NASA Mars Helicopter Fails to Respond for 4th Flight

The U.S. space agency NASA said the experimental Mars helicopter Ingenuity, after three successful flights, failed to respond to commands to lift off for a fourth flight Thursday. Scientists with the Ingenuity team at NASA’s Jet Propulsion Laboratory (JPL) in...


Greece to Lift Quarantine Rule for More Inbound Visitors

ATHENS - Greece will lift quarantine restrictions on coronavirus-free visitors from more countries including Australia and Russia from Monday as it extends exemptions ahead of formally opening up to tourists on May 15, the transport ministry said on Sunday. The...

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Biden’s Climate Pledge: Not Easy, Not Impossible

Cutting U.S. greenhouse gas emissions in half is doable but hard, experts say, and some of the biggest barriers are political, not technical. President Joe Biden on Thursday committed the United States to reducing emissions of planet-warming carbon dioxide and other gases...


US Sees Major Differences with Iran in Nuclear Talks

PARIS - Serious differences persist between the United States and Iran over how they might resume compliance with the 2015 Iran nuclear deal despite making some progress in their latest indirect talks in Vienna, a senior U.S. official said on...

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