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%2
http://www.pbs.org/wgbh/buildi....ngbig/lab/shapes.htm
http://www.childrensengineering.com/
http://www.design-technology.o....rg/suspensionbridges
http://wyrk.com/busiest-bridge....-in-world-dales-dail