Rwanda could become a significant player in the glass manufacturing value chain, supported by an estimated 73 million tonnes of silica-rich sand reserves spread across the country according to Rwanda ...

See **how to build stairs** to a unique **pool** made of nothing but **sand** and **dirt**! This **building** project is a truly **satisfying science**. Check out those perfect **nodal lines**!

(CNN) — In an age when clocks are found in most pockets and on every screen, watchmaker Col&MacArthur’s selling point is not just time, but history itself. Known for using unconventional materials — ...