Toxic algae turned a frozen lake green
In the Czech Republic, a frozen lake’s emerald green ice is giving biologists an unprecedented opportunity to study a strange—and ominous—natural phenomenon. At the end of 2025, researchers at Czech…
In the Czech Republic, a frozen lake’s emerald green ice is giving biologists an unprecedented opportunity to study a strange—and ominous—natural phenomenon. At the end of 2025, researchers at Czech…