From the bell that hasn't stopped ringing, to observing evolution in action, SciShow presents 6 of the Longest Experiments Ever.

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Sources:
The Electric Bell
http://www.physics.ox.ac.uk/history.asp?page=exhibit1
http://www.atlasobscura.com/places/oxford-electric-bell
http://www.popularmechanics.com/technology/gadgets/a22506/worlds-longest-running-battery-176-years/

Beal’s Seed Viability Experiment
http://www.cpa.msu.edu/beal/research/research_frames.htm
https://www.jstor.org/stable/2435371?seq=1#page_scan_tab_contents
http://www.amjbot.org/content/89/8/1285.full#ref-16

The Pitch Drop
http://www.nature.com/news/long-term-research-slow-science-1.12623
http://smp.uq.edu.au/content/pitch-drop-experiment
http://theconversation.com/explainer-the-pitch-drop-experiment-33734

Framingham Heart Study
https://www.framinghamheartstudy.org/about-fhs/research-milestones.php
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4159698/

E.Coli
http://myxo.css.msu.edu/ecoli/overview.html
https://www.sciencedaily.com/releases/2016/08/160801131102.htm
http://www.nytimes.com/2011/03/22/science/22evolve.html
http://news.harvard.edu/gazette/story/2014/02/evolution-in-real-time/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2430337/

500-year micro experiment
http://www.microbiologysociety.org/publications/microbiology-today/past-issues.cfm/publication/world-war-I/article/49E6A445-B246-4034-A4E2DE4314948E55
https://www.researchgate.net/publication/280698316_The_500_Year_Microbiology_Experiment
http://www.academia.edu/19752863/A_500-year_experiment

Image Links:
https://commons.wikimedia.org/wiki/File:Oxford_Electric_Bell.jpg
https://commons.wikimedia.org/wiki/File:Oxford-electric-bell.svg
https://commons.wikimedia.org/wiki/File:Kudzu_field_horz2.JPG
https://commons.wikimedia.org/wiki/File:The_history_of_the_Treman,_Tremaine,_Truman_family_in_America;_with_the_related_families_of_Mack,_Dey,_Board_and_Ayers;_being_a_history_of_Joseph_Truman_of_New_London,_Conn._(1666);_John_Mack_of_Lyme,_(14781664474).jpg
https://commons.wikimedia.org/wiki/File:University_of_Queensland_Pitch_drop_experiment.jpg
https://en.wikipedia.org/wiki/File:Richard_Lenski_with_Long-Term_Flasks_and_Incubator_on_May_26,_2016.jpg
https://en.wikipedia.org/wiki/Escherichia_coli#/media/File:EscherichiaColi_NIAID.jpg
https://en.wikipedia.org/wiki/File:Chrococcidiopsis_Glass_Ampoules.jpg
https://commons.wikimedia.org/wiki/File:500_Year_Microbiology_Experiment.JPG