Science news this week: James Webb telescope finds a never-before-seen substance, China's 'Great Green Wall' grows faster than natural trees, and a Medici murder mystery is solved - Live Science

This week's science roundup highlights the discovery of an unknown substance on Pluto and Titan by the James Webb Space Telescope. Other stories include the growth of China's 'Great Green Wall' and the resolution of a historical Medici murder mystery.
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Advancements in space observation and environmental science provide critical data for understanding our solar system and planetary health.
July 4, 2026: Our weekly roundup of the latest science in the news, as well as a few fascinating articles to keep you entertained over the weekend.
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