70's inventions

these two weeks my class has been studying the 70's in four different 

category's,  fashion, sport, events, and inventions 

this is a slide on 5 different 70's inventions 

1. the Sony Walkman

2. email

3. the 1st digital camera 

4. the Rubik's cube 

5. the Atari 2600

I like the layout and the pictures (credit not to me) 

but i think i needed more info