Uploaded November 2016 | Updated September 2026, 2 weeks ago

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A lot of people treat order-of-magnitude estimates like regular rounding. If you do that, then you're doing it wrong. Let's set the record straight. Also, this is the 100th video on this channel! WOOO!!!
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VIDEO ANNOTATIONS

Why Doesn't Light Have Mass?
youtu.be/ueuwWiR-Dw4
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HUGE THANK YOU TO THESE PATRONS:

** Nikko Lai, Randy Hukle, Ashley Hughes **
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SCIENCE ASYLUM STUFF

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EXTRA INFO LINKS

Orders of Magnitude:
en.wikipedia.org/wiki/Order_of_magnitude
en.wikipedia.org/wiki/Orders_of_magnitude_(numbers)

Etymology:
english.stackexchange.com/questions/28310/origin-of-ballpark-estimate-to-mean-a-very-rough-estimate
etymonline.com/index.php?term=decimal&allowed_in_frame=0

Logarithms:
en.wikipedia.org/wiki/Logarithm
en.wikipedia.org/wiki/Common_logarithm

Fermi Problems:
en.wikipedia.org/wiki/Enrico_Fermi
en.wikipedia.org/wiki/Fermi_problem
en.wikipedia.org/wiki/Back-of-the-envelope_calculation

Trinity Nuclear Test:
webcitation.org/6VDXaYUBL
en.wikipedia.org/wiki/Trinity_(nuclear_test)
en.wikipedia.org/wiki/TNT_equivalent

Upgrade Cost Calculation:
census.gov/prod/cen2010/briefs/c2010br-14.pdf
census.gov/prod/cen2010/briefs/c2010br-07.pdf
en.wikipedia.org/wiki/Home_energy_rating
aceee.org/files/proceedings/2008/data/papers/2_346.pdf
en.wikipedia.org/wiki/Emergency_Economic_Stabilization_Act_of_2008

Top 10 Scientists:
1. Richard Feynman
2. Nikola Tesla
3. Emmy Noether
4. Albert Einstein
5. Oliver Heaviside
6. Henrietta Leavitt
7. Émilie du Châtelet
8. Enrico Fermi
9. Lise Meitner
10. Hertha Ayrton
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100th VIDEO SUGGESTIONS

Cameron Risse - Tops of Tents:
youtube.com/watch?v=o5WLYPCB8yY&lc=z131x1w4bqm1hth2t23qs53xjyzjgxtiw04

Nenad Tepavac - Top 10 Scientists:
youtube.com/watch?v=o5WLYPCB8yY&lc=z13ec5i4toikglvr504chz34jmipw3nzc04

Hostshot_qo - 100 Greatst Scientists:
youtube.com/watch?v=o5WLYPCB8yY&lc=z12vy33gwpnnd50yz04cdxlhiqfdvv3q4tg0k
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COMMENT RESPONSES

Sean Oleson - Light and Mass:
youtube.com/watch?v=ueuwWiR-Dw4&lc=z13eylehtnn5xp3b304cht1o2teovhe4dms0k

Guest Informant - Light and Mass:
youtube.com/watch?v=ueuwWiR-Dw4&lc=z12ydtewwu32sjqum22esbroim2fwzq5x04

Tommy WizOh - Light and Mass:
youtube.com/watch?v=ueuwWiR-Dw4&lc=z12bhb4qmvvihdrbb04cjlpgupngzjkp1sw0k

Tony Skagerlund - Light Slows Down:
youtube.com/watch?v=ueuwWiR-Dw4&lc=z13xxxopauqzyxmqu04ceb2i1zzhida4ujk

K8UR Channel - Light Slows Down:
youtube.com/watch?v=ueuwWiR-Dw4&lc=z12bgvootzaecf0hd04cjnvqiv2twznp4ks0k
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IMAGE CREDITS

Logo designed by: Ben Sharef

Stock Photos and Clipart
- Wikimedia Commons commons.wikimedia.org/wiki/Main_Page
- Openclipart openclipart.org
- or I made them myself...

Log Pile:
commons.wikimedia.org/wiki/File:Kuopio_logs.jpg

Mile Marker:
commons.wikimedia.org/wiki/File:Mackinac_Island_July_2010_28_(M-185_mile_marker).JPG

Trinity Nuclear Test:
commons.wikimedia.org/wiki/File:Trinity_test_(LANL).jpg

Top 10 Scientists:
commons.wikimedia.org/wiki/File:HD.3A.053_(10481714045).jpg
commons.wikimedia.org/wiki/File:N.Tesla.JPG
commons.wikimedia.org/wiki/File:Noether.jpg
commons.wikimedia.org/wiki/File:Einstein_patentoffice_full.jpg
commons.wikimedia.org/wiki/File:Oheaviside.jpg
commons.wikimedia.org/wiki/File:Leavitt_aavso.jpg
commons.wikimedia.org/wiki/File:Emilie_Chatelet_portrait_by_Latour.jpg
commons.wikimedia.org/wiki/File:Enrico_Fermi_1943-49.jpg
commons.wikimedia.org/wiki/File:Lise_Meitner12.jpg
commons.wikimedia.org/wiki/File:Helena_Ars%C3%A8ne_Darmesteter_-_Portrait_of_Hertha_Ayrton.jpg