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Toilets That Make Compost Low-cost, sanitary toilets that produce valuable compost for crops.

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eTHINKING 4 Algebra 5 Ships use the speed of sound in water to help find the water’s depth. A sonar pulse from a ship is sent to the bottom of the ocean floor. The time…

Algebra 4 Ships use the speed of sound in water to help find the water’s depth. A sonar pulse from a ship is sent to the bottom of the ocean floor. The time taken for…

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