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

According to Live Science, this week brought three fascinating discoveries from the science world. The James Webb Space Telescope spotted something scientists have never seen before — a mysterious new substance lurking in the cosmos. Meanwhile, China's Great Green Wall — a massive reforestation project — is sprouting faster than nature would typically manage on its own. And in a centuries-old whodunit, researchers finally cracked the case of a Medici murder mystery. Three reminders that the universe still has plenty of surprises left to reveal.

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