Hacker News
new
|
past
|
comments
|
ask
|
show
|
jobs
|
submit
|
AstroNutt's submissions
login
1.
How Traffic Lights Work
(
youtube.com
)
1 point
by
AstroNutt
2 days ago
|
past
|
1 comment
Guidelines
|
FAQ
|
Lists
|
API
|
Security
|
Legal
|
Apply to YC
|
Contact
Search:
