Earth badges

According to Khan Academy, "Earth badges are rare. They require a significant amount of learning". They are rare.
== Earth Badges on Khan ==
Two of the easier or at least more common badges in this category are Sub-light Speed for getting 42 questions right quickly and Work Horse for mastering 50 skills.
The three hardest to get Earth badges that you hear people say they want are 10,000 Year Clock for reaching a 100 day streak, Sensei for getting 50 answers with 3 or more votes, and Incredible inspiration for getting 50 valid spin-offs (code must be changed to count).
Badges List (All descriptions directly from Khan Academy's webpage)
Speed Badges: 	
Speed Badges: 	
Speed Badges:
Sub-light Speed 
[1500 Energy Points(e.p.)] 	299,792,458 Meters per Second
[5000 e.p] 	Double Power Hour
Quickly & correctly answer 42 skill problems in a row (time limit depends on skill difficulty)	Quickly & correctly answer 75 skill problems in a row (time limit depends on skill difficulty)	Correctly answer 180 problems and watch 30 minutes of video in 2 hours
Inspiration Badges: 	
Inspiration Badges:
Great Inspiration 
[2500 e.p.] 	Incredible Inspiration [ 5000 e.p]
Other users created 25 programs based on one of yours	Other users created 50 programs based on one of yours
Mastery Badges: 		Learning Badges 	Learning Badges
Work Horse 
[14000 e.p] 		Ridiculous Listener 	10,000 Year Clock
Achieve mastery in 50 unique skills		Watch 4 hours of video in a single topic	Watch part of any video or work on any skill each day for 100 consecutive days
Patron Badges (donations) 	
Patron Badges (donations) 	
Patron Badges (donations)
2015 Patron 	2016 Patron 	2017 Patron
Support Khan Academy with a donation in 2015	Support Khan Academy with a donation in 2016	Support Khan Academy with a donation in 2017
Discussion Badges 	
Discussion Badges 	
Discussion Badges
Guru 	Incredible Teacher 	Sensei
Post 10 answers that earn 3+ votes 	Post 25 answers that earn 3+ votes 	Post 50 answers that earn 3+ votes
Rave Reviewer 	Great Answer 	Incredible Answer
Evaluate 150 projects 	Post an answer that earns 25+ votes	Post an answer that earns 50+ votes
Incredible Question 	Great Question 	Investigator
Ask a question that earns 50+ votes	Ask a question that earns 25+ votes	Ask 10 questions that earn 3+ votes
Energy Points Badges
Five Times Ten to the Fifth
Earn 500,000 energy points
Helen Keller
"Earn 750,000 energy points.
Helen Keller (1880-1968) was born [sic] blind and deaf. With the help of her teacher Anne Sullivan, she went on to graduate from college and became an influential writer, lecturer, and activist. Be like Keller and keep on learning!" **
**Fact error is part of current badge description
Membership Badges 	Membership Badges
Sequoia 	Bristlecone
Remain a member of Khan Academy for 3 years	Remain a member of Khan Academy for 4 years
Category:KA badges