These are some current events topics that might interest you, for which you will find a lot of research material:

 

HIV/AIDS
Juvenile Crime
Gangs
Terrorism
Iraq
The Economy
Presidential Elections
Computer Viruses

Musical Styles and Artists:

Hip Hop
Jazz
Rock and Roll
Reggae
Rhythm and Blues
Gospel
Classical

Fashion:

Pick any decade

Communications Media:

Television
Radio
Movies
Internet

Performance Media:

Theater
Dance

What life was like during:

Colonial Times
The Middle Ages
The Renaissance
The Industrial Revolution

Any major armed conflicts

World War I
World War II
The Civil War (in America
THe Russian Revolution
The French Revolution
The Haitian Revolution
The American Revolution
The Persian Gulf War
The Vietnam War

Any major past civilizations worldwide

In South America:
Aztec
Inca
Maya

In Africa:
Songhai
Ghana
Mali

In China:
Tang Dynasty
Ming Dynasty
Song Dynasty

In the Middle East and North Africa:
Islamic Empire
Ottoman Empire

Periods in American History:

Colonial period
Slavery
Westward Expansion
Reconstruction
Roaring Twenties
Cold War
The Sixties

Physics:

Space
Sound
Magnetism
Electricity
Light/Optics
Machines/Engines

Biology:

Plants
Animals
Human Beings
Ecology
Genetics

Chemistry:

Elements
Compounds
Reactions