3 ms·
Is air not touching the thing it's picking up? Because if it is, there's physical contact.
by fake-name 5y ago
Is air not touching the thing it's picking up?
Because if it is, there's physical contact.
- Foomf 5y agoI was thinking that too. This wouldn't work in a vacuum.
- robbedpeter 5y agoWell, no, but that comes along with the idea of "sound," so...