With 4-Down, retro device shown as "half-open" in this puzzle's highlighted squares
1
2
3
4
5
6
7
8
Orizzontali
1A
With 4-Down, retro device shown as "half-open" in this puzzle's highlighted squares
5A
Make waves?
6A
_____ Park, California (home to the corporate headquarters of Meta)
7A
"Cosmos" author who wrote "The nitrogen in our DNA, the calcium in our teeth, the iron in our blood, the carbon in our apple pies were made in the interiors of collapsing stars. We are made of starstuff."
8A
"I agree"
Verticali
1D
Reason for a pet-owner to buy NexGard
2D
Vowel sound heard in 8-Across
3D
One of the three largest Abrahamic religions
4D
See 1-Across
5D
Communication format used in 1-Across / 4-Down, in brief