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ScienceDaily: Top Science News |
| Lightning and subvisible discharges produce molecules that clean the atmosphere Posted: 29 Apr 2021 11:19 AM PDT Scientists have found that lightning bolts and, surprisingly, subvisible discharges that cannot be seen by cameras or the naked eye produce extreme amounts of the hydroxyl radical and hydroperoxyl radical. The hydroxyl radical is important in the atmosphere because it initiates chemical reactions and breaks down molecules like the greenhouse gas methane. |
| Was North America populated by 'stepping stone' migration across Bering Sea? Posted: 29 Apr 2021 08:24 AM PDT A new study documents the newly named Bering Transitory Archipelago and then points to how, when and where the first Americans may have crossed. The authors' stepping-stones hypothesis depends on scores of islands that emerged during the last ice age as sea level fell when ocean waters were locked in glaciers and later rose when ice sheets melted. |
| Global glacier retreat has accelerated Posted: 29 Apr 2021 06:51 AM PDT Scientists have shown that almost all the world's glaciers are becoming thinner and losing mass -- and that these changes are picking up pace. The team's analysis is the most comprehensive and accurate of its kind to date. |
| Mammals evolved big brains after big disasters Posted: 29 Apr 2021 06:02 AM PDT A large study reveals the way relative brain size of mammals changed over the last 150 million years. |
| Icy clouds could have kept early Mars warm enough for rivers and lakes Posted: 26 Apr 2021 12:48 PM PDT A new study led by a planetary scientist uses a computer model of Mars to put forth a promising explanation onto how Mars once contained rivers and lakes: Mars could have had a thin layer of icy, high-altitude clouds that caused a greenhouse effect. |
| A new perspective on the genomes of archaic humans Posted: 26 Apr 2021 12:48 PM PDT Researchers examined 14,000 genetic differences between modern humans and our most recent ancestors at a new level of detail. They found that differences in gene activation -- not just genetic code -- could underlie evolution of the brain and vocal tract. |
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