AP Top Science News at 7:19 p.m. EST

Making pig livers humanlike in quest to ease organ shortage

Biden signs bill to study salt lakes in drought-hit US West

Long COVID: Could mono virus or fat cells be playing roles?

China’s COVID-19 surge raises odds of new coronavirus mutant

Deaths of 3 endangered Cambodian dolphins raise alarm

Glass act: Scientists reveal secrets of frog transparency

EXPLAINER: Arctic blast sweeps US, causes bomb cyclone

Japan adopts plan to maximize nuclear energy, in major shift

Canadian polar bears near ‘bear capital’ dying at fast rate

California earthquake puts early warning system to the test

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