Part of the Advanced Higher CDT course involves making a time line of the 20th Century.
Here are a few helpful websites available to get you going:
The BBC has a good guide to British History
About.com has some excellent stuff on the 20th Century including a section on Inventions in a handy time line.
For a British Science time line try Brits at their Best
For Product Design Timeline try Industrial Design History
SCRAN has a excellent collection of images and extra information - NB: you need to be in school or the public library to access it
BUBL Links are pre-checked websites that have been added to a database that can be browsed or searched.
Top Tip:
To manage better Google searches have a read of the tips from Harvard University