Reported meteor hits http://bolid.es
The scale is mind-boggling http://scaleofuniverse.com
Sky map https://www.google.co.in/sky/
How old are you according to https://www.how-old.net
Find out where an image has been used before https://www.tineye.com
Find an old version - software http://www.oldversion.com
Test your writing - see if it's readable https://readable.io
This one lets you print good parts of any webpage while skipping adds and junk. http://www.printwhatyoulike.com
Interactive Periodic Table https://ptable.com
Read a book https://openlibrary.org
BioMedCentral is an archive of over 170 biology, chemistry and medical journals. https://www.biomedcentral.com/journals
Let's end the list with this one
http://attackofthecute.com/popular.php
