Hacker News
new
|
past
|
comments
|
ask
|
show
|
jobs
|
submit
|
from
login
If you blow air through sand, it becomes a “fluidized bed,” and acts like liquid
(
twitter.com/sci_phile
)
4 points
by
traviswingo
on Sept 22, 2017
|
past
Consider applying for YC's Summer 2026 batch! Applications are open till May 4
Guidelines
|
FAQ
|
Lists
|
API
|
Security
|
Legal
|
Apply to YC
|
Contact
Search:
