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In this video:

There’s a rather persistent idea that “reboiling” water (i.e. boiling water two or more times and allowing it to cool in-between) while making a cup of tea is potentially harmful to your health, with some going so far as stating that regularly doing this even drastically increases your chances of getting cancer. The general reasoning behind why this is purportedly the case goes something like this:

Want the text version?: http://www.todayifoundout.com/index.p...

Sources:

http://www.hindawi.com/journals/isrn/...
https://www.google.com/url?sa=t&rct=j...
https://www.researchgate.net/publicat...
http://www.fondriest.com/environmenta...
http://link.springer.com/article/10.1...
http://www.ncbi.nlm.nih.gov/pmc/artic...
http://www.who.int/water_sanitation_h...
http://chemwiki.ucdavis.edu/Core/Phys...
http://serc.carleton.edu/microbelife/...
http://www.ncbi.nlm.nih.gov/pmc/artic...
http://antoine.frostburg.edu/chem/sen...
http://www.who.int/water_sanitation_h...
http://www.academicjournals.org/artic...
https://www.researchgate.net/publicat...
   • Doc Brown - My Proper Tea  
http://www.tandfonline.com/doi/abs/10...