3. BASEBALL

There's probably no sport followed with as much statistical detail as
baseball. One website has done its utmost to get the historical
record online. Among other details, you'll find box scores for games
over the past 40 years and game summaries all of the way back to 1871:
Retrosheet
http://www.retrosheet.org


6. INTERNET ARCHIVE

Google doesn't track the history of web pages, only what's there
currently. But the Internet Archive's Wayback Machine does. Try it
for www.google.com and see what the pages looked like in 1998. The
reason researchers love this tool so much is that it becomes more
valuable every month as a historic reflection of the World Wide Web:
Internet Archive
http://www.waybackmachine.org