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Readers dispute starfishes' water-swirling abilities

Your comments on the February 4, 2017, issue of Science News

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12:22pm, March 8, 2017

Doomsday preppers

Dinosaurs and other creatures were largely wiped out 66 million years ago from an asteroid impact, volcanic eruptions or maybe a mix of the two, Thomas Sumner reported in “Devastation detectives” (SN: 2/4/17, p. 16), in the Science News special report “Dino Doomsday.”

Online reader Mike van Horn wondered if the timing of the v­olcanic eruptions, which happened for h­undreds of thousands of years before and after the asteroid impact, could have allowed marine organisms to adapt to increasingly acidic oceans.

Scientists don’t know if bouts of volcanic eruptions helped marine critters survive the

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