Part 63 Article: Timeline My Blog Title: The untold the retold Click On This Link 🔗 To Download Full Quality Size Of This Photo Size 4096 × 4096 8.13 MB Click on PDF to download from Part 1 COLUMN R 1279–1368 AD Yuan Dynasty & Mongol 元朝 16 Emperors Duration: 89 Years • Songhai Empire West Africa 1340–1591 AD From [AI overview]: The defining feature of the trans-Saharan trade was the highly lucrative exchange of West African gold for Saharan salt . West African empires exchanged vast quantities of abundant gold for essential rock salt from the Saharan desert. This network connected sub-Saharan Africa to the Mediterranean using massive camel caravans and facilitated profound cultural and religious diffusion. West Africa (such as the regions controlled by the Mali and Songhai empires) possessed massive gold deposits but lacked salt, which was critical for preserving food and health. The Sahara Desert was rich in salt but lacked gold, creating a perfect interdepen...
Part 34 Article: Biotechnology My Blog Title: The world, from the past to the present, retold from the timelines. Click on PDF to download from Part 3 2023: Researchers reported a production method for spider silk fibers from gene-edited transgenic silkworms for a sustainable alternative material six times stronger than Kevlar. Now, researchers had successfully gene-edited silkworms to produce spider silk that’s six times stronger than Kevlar, the material used in bulletproof vests. This heavy-duty fiber could one day be used for surgical sutures, wound dressings, armored vests and structural materials for vehicles. It could also one day serve as a greener alternative to synthetic materials, like polyester and nylon, which shed harmful microplastics and were derived from fossil fuels. Researchers recently described their process and findings in the journal Matter. To advance ecological civilization, developing sustainable, eco-friendly high-strength and ultra-tough alternatives to non-...