The National SAFEKIDS Campaign recommends that no child under the age of 12 be left at home alone. However, consider a child's age and maturity level. For example, if a child is extremely impulsive, it might be best to wait until he or she is older than 12.
Did people and dinosaurs live at the same time? No! After the dinosaurs died out, nearly 65 million years passed before people appeared on Earth. However, small mammals (including shrew-sized primates) were alive at the time of the dinosaurs.
The major divisions are called eras. These are sub-divided into smaller time zones called periods. Within each period are smaller divisions called Ages (not shown in this diagram). Dinosaurs lived in the Mesozoic Era, which is divided into the Triassic, Jurassic and Cretaceous Periods. Humans live in the Quaternary Period of the Cenozoic Era.