Hacker News
new
|
past
|
comments
|
ask
|
show
|
jobs
|
submit
login
Building ventilation invented by ancient Persians/Romans making modern comeback
(
cbc.ca
)
5 points
by
bookofjoe
3 months ago
|
hide
|
past
|
favorite
Guidelines
|
FAQ
|
Lists
|
API
|
Security
|
Legal
|
Apply to YC
|
Contact
Search:
