are there any articles with examples of checks and balances, we need at least three.

Answer 1

http://www.google.com/#q=+examples+of+checks+and+balances

Answer 2

we actually need current event kind of articles, thankyou though.

Answer 3

Research in this section:
https://www.google.com/#q=News&tbm=nws

Presidential vetoes
Supreme Court decisions
Congressional bills