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The two-wagon set was one of five constructed and used between 1883 and 1898, when 18 mules and two horses were used to pull two large wagons that transported sodium borate 165 miles from Death Valley to a Mojave station.

Borax, or sodium borate decahydrate, is a salt made of a combination of boron, sodium, oxygen and hydrogen.

Slime can teach kids basic lessons about cross-linking molecules, like sodium borate, the active ingredient in Borax that ties the long, molecular chains of glue together to create the slimy consistency.

Also known as sodium borate, borax has a range of household uses including as an insecticide, a stain remover and a deodoriser.

One of the product’s ingredients, sodium borate, remains in use today; you might know it better as 20 Mule Team Borax, a laundry detergent.