The World Humans Made - page 10

computer,

3, 6-7,

20-21

discovery,

electricity,

engineers,

7, 12,

15, 20-21

fire,

14-15

human-made

world,

6, 8

machines,

7, 20

math,

natural world,

4-5,

8, 10, 12-13, 15

science,

scientists,

shelter,

12-13, 14-15

smartphone,

systems,

technology,

Index

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1,2,3,4,5,6,7,8,9 11,12