Parasites: http://www.ncbi.nlm.nih.gov/pubmed/21118945
and: http://en.wikipedia.org/wiki/Parasitic_worm#Intestinal_helminths
The Great Famine: http://en.wikipedia.org/wiki/Great_Famine_(Ireland)
breathing earth: http://breathingearth.net/
Anne Hathaway is very pretty in my opinion: http://annehathawayfan.com/
Shakespeare also liked that name: http://en.wikipedia.org/wiki/Anne_Hathaway_(Shakespeare)
First photographs: http://en.wikipedia.org/wiki/History_of_photography
colorized photo: http://www.lunarlog.com/colorized-boulevard-du-temple-daguerre/
First image on the internet: http://en.wikipedia.org/wiki/Les_Horribles_Cernettes
Gangkhar Puensum: http://en.wikipedia.org/wiki/Gangkhar_Puensum
CGPGrey on continents: http://www.youtube.com/watch?v=3uBcq1x7P34