Discover and read the best of Twitter Threads about #bridges
Most recents (2)
Let's talk BRIDGES. Precolonial Indigenous engineers devised some pretty neat ways to span the canyons, chasms, and gullies of BC. Come along for a mo... #archaeology (all pics @BCarchives) 1/ 
Without milled lumber, cement or steel, before giant drills and pile drivers, Indigenous people engineered spans as long as 150 feet across, hanging 50 feet above the swift and turbulent rivers below. (sketch probably H.K. Woods, 1898) 2/ 
This bridge over the Cranberry (Salmon) River was made by bending and tying poles with cedar withes (thin, flexible branches), looking a lot like in-stream fish traps built with the same materials. (1905 photo) 3/ 
One thing I’m worried about—in addition to my family’s safety—re: #Maria in #PuertoRico is how #colonialism capitalizes on #NaturalDisaster
In the early 1900s US #businesses were able to monopolize #PuertoRican farm land after Hurricane San Ciriaco (1899) devastated the #island
#Farmers who were never able to rebuild after the #hurricane were forced to either give up their #land or enter unjust agreements
