From the bell that hasn't stopped ringing, to observing evolution in action, in this new episode with Hank Green, SciShow presents 6 of the longest experiments ever conducted. Let's go!
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Sources:
The Electric Bell
http://www.physics.ox.ac.uk/history.a...
http://www.atlasobscura.com/places/ox...
http://www.popularmechanics.com/techn...

Beal’s Seed Viability Experiment
http://www.cpa.msu.edu/beal/research/...
https://www.jstor.org/stable/2435371?...
http://www.amjbot.org/content/89/8/12...

The Pitch Drop
http://www.nature.com/news/long-term-...
http://smp.uq.edu.au/content/pitch-dr...
http://theconversation.com/explainer-...

Framingham Heart Study
https://www.framinghamheartstudy.org/...
https://www.ncbi.nlm.nih.gov/pmc/arti...

E.Coli
http://myxo.css.msu.edu/ecoli/overvie...
https://www.sciencedaily.com/releases...
http://www.nytimes.com/2011/03/22/sci...
http://news.harvard.edu/gazette/story...
https://www.ncbi.nlm.nih.gov/pmc/arti...

500-year micro experiment
http://www.microbiologysociety.org/pu...
https://www.researchgate.net/publicat...
http://www.academia.edu/19752863/A_50...

Image Links:
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://commons.wikimedia.org/wiki/Fi...
https://en.wikipedia.org/wiki/File:Ri...
https://en.wikipedia.org/wiki/Escheri...
https://en.wikipedia.org/wiki/File:Ch...
https://commons.wikimedia.org/wiki/Fi...