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The outbreak of bird flu in the U.S. has alarmed researchers and prompted new efforts to track the virus that's already killed millions of birds from Europe to Antarctica. As H5N1 continues to jump into mammals, many scientists are concerned that we're not watching closely enough as this virus spreads. William Brangham reports. A warning: This story contains scenes of animals in distress. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

In our news wrap Saturday, Israel issued more evacuation orders forcing tens of thousands of Palestinians to flee Rafah, Russian forces took control of five villages outside Kharkiv amid a renewed offensive in Ukraine's northeast, flash floods in Afghanistan, Brazil and Kenya have killed hundreds of people, and unusually strong solar storms are producing brilliant northern lights on Earth. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

To most people, the sun is a steady, never-changing source of heat and light. But to scientists, it's a dynamic star, constantly in flux, sending energy out into space. Experts say the sun is now in its most active period in two decades, causing potential disruptions to radio and satellite communications. John Yang speaks with Bill Murtagh of NOAA's Space Weather Prediction Center to learn more. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

New research is revealing the secrets of Io, the mysterious volcanic moon of Jupiter. Four centuries after Galileo discovered Io in 1610, NASA sent a spacecraft called Juno on a five-year mission to Jupiter and its moons. Last week, NASA released animated artists' conceptions of Io based on data Juno collected during two flybys. John Yang reports. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

Data shows that global levels of the three main heat-trapping greenhouse gases -- carbon dioxide, methane and nitrous oxide -- all reached record highs in 2023 for the second year in the row, and experts say there's no end in sight. But a new book, 'H Is for Hope,' says there is reason for hope in the fight against climate change. William Brangham speaks with its author, Elizabeth Kolbert. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders

Millions of people on Monday watched a rare total eclipse cut across the U.S., Mexico and Canada, plunging some towns and cities into darkness for several minutes. In many other places it was a chance to view a partial eclipse. Miles O'Brien, who witnessed the spectacle from Dallas, has our report. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders