system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do spiders make those single lined several meters long spiderwebs that hit you in the face from time to time

And what for?
Sorry, english is not my native language.
gpt
Those single threads that cross large gaps are either leader threads they released into the wind specifically to cross the gap or an escape thread that a spider used to drop down to the ground.

Spiders often let the wind carry a long leader thread from one tree to another so that they can quickly cross in relative safety instead of taking the long way across the ground.  They have no way to reel the thread back in, so they abandon it if they’re not planning to build a web in that spot.