|
|
|
|
 |
 |
|
|
 |
 |
 |
 |
| |
|
|
| Interesting Fact |
 |
|
 |
| The first U.S. patent, issued in 1790 to Samuel Hopkins for a potassium compound, was signed by both President George Washington and then Secretary of State Thomas Jefferson. |
|
|
 |
| Did you know... |
 |
|
 |
| You can purchase group licenses to MyPlan.com assessment tests for schools and businesses at steeply discounted prices. |
|
|
|
|
 |
|
|