A SciShow Kids viewer wrote us to ask how bridges are strong enough to carry cars and trucks! Jessi and Squeaks can explain — with blocks!
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SOURCES:
http://www.k5architecture.org/pdf/g2%20-%20Grade%202.pdf
http://www.pbs.org/wgbh/buildingbig/lab/shapes.html
http://www.childrensengineering.com/
http://www.design-technology.org/suspensionbridges.htm
http://wyrk.com/busiest-bridge-in-world-dales-daily-data/)
