News

Climate

Central American fires may intensify U.S. tornadoes

Smoke originating from Central American fires may strengthen U.S. tornadoes.

Neuroscience

Immune system may remember and adapt to stress

Mice without immune systems who receive stressed immune cells are less anxious and more social, suggesting that the immune system can adapt to stress.

Paleontology

Snakes crawled among Jurassic dinosaurs, new timeline says

Earliest snake fossils provide evidence snakes evolved their flexible skulls before their long, limbless bodies.

Chemistry

Sodium and other alkali explosions finally explained

A high-speed camera snaps sharp details of how alkali metals explode in water — a classic, but until now, not fully explained chemical reaction.