. . . . . . "One satellite, two measurements, two very different results\n\nHow do scientists know a tool really works? They test it again, carefully — in a new place, with different equipment. That re-testing is called replication, and it is how science checks itself.\n\nThe question: A satellite called Sentinel-2 takes pictures of Earth from space. Can it measure the quality of water in an estuary (where a river meets the sea) — using only free software that anyone can download?\n\nThe test: The team measured two things from space and checked them against real measurements made in the water: how cloudy or muddy the water was, and how much tiny green algae it contained. If the satellite's numbers matched the real ones, the method works.\n\nThe result: For muddiness, the satellite got it right. For algae, it got it wrong — in this murky water it simply could not measure the algae reliably. Same satellite, same water, but one answer you can trust and one you cannot.\n\nThe big lesson: a tool can be excellent at one job and unreliable at another. Never assume — test each use on its own. That is exactly what replication is for." . . . . . . . "Plain-language summary of the Westerschelde synthesis (For schools)" . "2026-07-26T14:40:00.833090+00:00"^^ . . "RSA" . "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAyuQ7Hi/zQ7hDZtMtLWK1JKU83Kgo8NqC+b8sxD5IoiekPctXVA8iM0zD/9pcp1txGXjX/fUj5HRUkOn4RVHP3fFa/3irQYpZFQ5fHRj8MQ7kJ6AEd1oggfajDevZGz63hj6Vigo+BNYBXqhcbWVAfLfbzQPAegce9zH6n9vTqKYMrwrSxPQdhoAcoaKOqY8gRiJgzekeEr+iEqa63X1HwWtYDs7X25a9xWbgaDSsRjzZGVUVOn1vYdSfWAaIw+EB9CiJfKm1zuXcur5PDziMW1pnZG6/NQtrA7AM3gLnoSoU3glkm5UhksGNqu2SV+j8oZLg7v6C5/sg2f6LIJMeFwIDAQAB" . "QpW5Nv98TJ2ELP1JBhZMJT/Q5t8HEWU2TVmOnF4QlqbEnS9bA3HQ34Hg6NSRyP/T7JmrTMTQ+7FyWUbAL4yZErzEsa+o2WJgyw/TSHEr8XEmOHK4h2duUoQNAXTKZEcTi1taQymCVRSAljsrm6eoH1iCG5cDqOCMukDORqH+sF4G/ls2U9ySBzfJ/9VN4suEHg/wBsydHrGWuAc9ZLQzFBSDh/CzCEDoeYEJw9/0t70XConAwn/WZmS+MG/K0RpGrBuVmXFNqDWb09OacVOkb2juHwlDtmX9krHRTj6gr+cuSkPWM0yIorg0ykvGuRPNVGOiJSgOtFIYVAq2cKf10Q==" . . .