This guy ought to have 1M subs. One of the most well produced, informative and educational channels I didn't know existed. https://www.youtube.com/user/TechLaboratories
Channel where you can see movies summed up in 8-Bit http://www.youtube.com/channel/UCVtL1edhT8qqY-j2JIndMzg
ryPod Shuffle: 3 minute movie and game reviews! https://www.youtube.com/rypodshuffle
Lego Channel with awesome animation and reviews https://www.youtube.com/user/alexsplanet
This Exists - Digging up the pop culture peculiarities and nonsense that exists in the darkness on the edge of town https://www.youtube.com/user/thisexists/featured
PatrickJMT https://www.youtube.com/watch?v=HflALiqXJDo
The Brain Scoop https://www.youtube.com/user/thebrainscoop
In a Nutshell – Kurzgesagt https://www.youtube.com/channel/UCsXVk37bltHxD1rDPwtNM8Q
ElectroBOOM AKA Mehdi Saghadar https://www.youtube.com/user/msadaghd
Veritasium https://www.youtube.com/user/1veritasium/videos
numberphile https://www.youtube.com/user/numberphile
computerphile https://www.youtube.com/user/computerphile
Vi Hart http://www.youtube.com/user/vihart
Link https://www.youtube.com/channel/UCUcyEsEjhPEDf69RRVhRh4A
It's History https://www.youtube.com/user/BlastfromthePast
C&Rsenal http://www.youtube.com/watch?v=xMj94EukVQc
Engineer Guy https://www.youtube.com/user/engineerguyvideo/videos
link here https://www.youtube.com/user/EngineeringExplained
Applied Science https://www.youtube.com/user/bkraz333
AVE https://www.youtube.com/user/arduinoversusevil
EEVBlog https://www.youtube.com/user/EEVblog
Nurd Rage https://www.youtube.com/user/NurdRage
Wranglerstar https://www.youtube.com/user/wranglerstar
Food Wishes https://www.youtube.com/user/foodwishes
Every Frame Is A Painting https://www.youtube.com/user/everyframeapainting?app=desktop
CGP Grey https://www.youtube.com/user/CGPGrey
BradyStuff https://www.youtube.com/user/BradyStuff
series on voting systems and their positives/negatives https://www.youtube.com/watch?v=s7tWHJfhiyo
Minute Physics http://www.youtube.com/user/minutephysics
Crash Course http://www.youtube.com/user/crashcourse
The RSA https://www.youtube.com/user/theRSAorg
VSauce https://www.youtube.com/user/Vsauce
Tell Me Why https://www.youtube.com/channel/UCVcDBXwTxKIDGpfB7NTvqOQ
ASAP Science https://www.youtube.com/user/AsapSCIENCE
Numberphile https://www.youtube.com/user/numberphile
QualiaSoup https://www.youtube.com/user/QualiaSoup
Veritasium https://www.youtube.com/user/1veritasium
SciShow https://www.youtube.com/user/scishow
Smarter Every Day https://www.youtube.com/user/destinws2/
Wisecrack? https://www.youtube.com/user/thugnotes
Vsauce https://youtube.com/user/Vsauce
Vsauce2 https://youtube.com/user/Vsauce2
Vsauce3 https://youtube.com/user/Vsauce3
Veritasium https://youtube.com/user/1veritasium
Healthcare Triage https://www.youtube.com/channel/UCabaQPYxxKepWUsEVQMT4Kw
Brainscoop https://youtube.com/user/thebrainscoop
Sci Show https://youtube.com/user/scishow
SmarterEveryDay https://youtube.com/user/destinws2
Minutephysics https://youtube.com/user/minutephysics
Vihart https://youtube.com/user/Vihart
Kurz Gesagt https://www.youtube.com/user/Kurzgesagt/featured
Extra Credits https://www.youtube.com/user/ExtraCreditz
Idea Channel https://www.youtube.com/user/pbsideachannel
Errant Signal https://www.youtube.com/watch?v=FRTsl1jCqq8&list=UUm4JnxTxtvItQecKUc4zRhQ
The Slow Mo Guys https://www.youtube.com/channel/UCUK0HBIBWgM2c4vsPhkYY4w
Whatever https://www.youtube.com/channel/UC37PFGlxWgx4tU6SlhPCdCw
The Dictionary of Obscure Sorrows https://www.youtube.com/user/obscuresorrows
Shots of Awe https://www.youtube.com/user/ShotsOfAwe
PESfilm https://www.youtube.com/channel/UCXN7NMwjjQpBHxzMwOPYzjQ
Tom Scott https://www.youtube.com/channel/UCBa659QWEk1AI4Tg--mrJ2A
Vlogbrothers https://www.youtube.com/user/vlogbrothers/
Balmafula Lanando https://www.youtube.com/channel/UC_tLKCMX0zw3kwfgqZki5rg
Vlogbrothers https://www.youtube.com/user/vlogbrothers/
Lindybeige https://www.youtube.com/channel/UC9pgQfOXRsp4UKrI8q0zjXQ
Skallagrim https://www.youtube.com/channel/UC3WIohkLkH4GFoMrrWVZZFA
mikeselectricstuff https://www.youtube.com/user/mikeselectricstuff
EEVBlog https://www.youtube.com/user/EEVblog
EricTheCarGuy https://www.youtube.com/user/EricTheCarGuy
Crash Course https://www.youtube.com/user/crashcourse
Geography now! https://www.youtube.com/user/GeographyNow/videos
Tom Scott https://www.youtube.com/user/enyay
Periodic Videos. https://www.youtube.com/channel/UCtESv1e7ntJaLJYKIO1FoYw
Derek Banas https://www.youtube.com/user/derekbanas
Dave on EEVBlog https://www.youtube.com/user/EEVblog/
Zogg from Betelgeuse https://www.youtube.com/channel/UCKY00CSQo1MoC27bdGd-w_g
The Great War https://www.youtube.com/channel/UCUcyEsEjhPEDf69RRVhRh4A
scholagladiatoria https://www.youtube.com/user/scholagladiatoria
Sexplanations https://www.youtube.com/channel/UCkxMlA7rt-mnIc1AjbyAsPw
Matthias Wandel https://www.youtube.com/channel/UCckETVOT59aYw80B36aP9vw
Pantorouter https://www.youtube.com/watch?v=PDPrFJazD3Q&index=1&list=PL7A1D94FF4FF10854
Applied Science https://www.youtube.com/user/bkraz333