Throughout all of history, people everywhere have invented and used
tools. Most tools of today are different from those of the past but many
are modifications of very ancient tools.
| NSES Content Standard E
Science and Technology: Understanding about science and technology Grades K-4, page 138 People have always had problems and invented tools and techniques (ways of doing something) to solve problems. Trying to determine the effects of solutions helps people avoid some new problems. |