Money (real/counterfiet)?

[kidzpca]

Looking at money how can you tell if the bills are real?

Thanks

[Lild]

The new ones have a haligram thingie of a head in the corner if ya hold it to the light, alot of older ones has the line through it when you hold it to the light....I would just go to the bank and pick up one of the pens that tell ya