The Truth about Orders of Magnitude (100th video)

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?
https://youtu.be/ueuwWiR-Dw4
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HUGE THANK YOU TO THESE PATRONS:

** Nikko Lai, Randy Hukle, Ashley Hughes **
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EXTRA INFO LINKS

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

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

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

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

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

Upgrade Cost Calculation:
https://www.census.gov/prod/cen2010/briefs/c2010br-14.pdf
https://www.census.gov/prod/cen2010/briefs/c2010br-07.pdf
https://en.wikipedia.org/wiki/Home_energy_rating
http://aceee.org/files/proceedings/2008/data/papers/2_346.pdf
https://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:
https://www.youtube.com/watch?v=o5WLYPCB8yY&lc=z131x1w4bqm1hth2t23qs53xjyzjgxtiw04

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

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

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

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

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

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

K8UR Channel - Light Slows Down:
https://www.youtube.com/watch?v=ueuwWiR-Dw4&lc=z12bgvootzaecf0hd04cjnvqiv2twznp4ks0k
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Log Pile:
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Mile Marker:
https://commons.wikimedia.org/wiki/File:Mackinac_Island_July_2010_28_(M-185_mile_marker).JPG

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

Top 10 Scientists:
https://commons.wikimedia.org/wiki/File:HD.3A.053_(10481714045).jpg
https://commons.wikimedia.org/wiki/File:N.Tesla.JPG
https://commons.wikimedia.org/wiki/File:Noether.jpg
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