By declaring certain areas off-limits and setting catching limits or quotas. Hope this helps :)
Because that literally means what a semi-permeable membrane is.It allows some things to pass through it, and others not to
Explanation:
Larger lenses are heavier, and tend to sag under their own weight, ruining the image quality as the lenses distort. The long mounting tubes are hard to make mechanically stiff, and so they tend to flex under the weight of the lens, making it hard to keep the optics in alignment.
A little bit less than a purposely discovery. A discovery that you've been looking for for a while would be like 75% of discovering but accidentally would be 35% of actually discovering something accidentally.
