This massive spider web in Madagascar was woven by Darwin's bark spider, a recently-discovered arachnid that uses its incredibly-strong silk, ten times tougter than Kevlar, to make the world's largest webs. These spiders are known to make orb webs in Andasibe-Mantadia National Park up to 2.8 meters square anchored by 25-meter threads. More photos at National Geographic, and the scientists' reports in PLoS ONE.
David Pescovitz is Boing Boing's co-editor/managing partner. He's also a research director at Institute for the Future. On Instagram, he's @pesco.