TV series example of the word

The Big Bang Theory Season 1, Episode 2
I think what you're feeling is valid and maybe later today...

The Big Bang Theory Season 1, Episode 3
It was sparsely sourced, but I think the science is valid.

The Big Bang Theory Season 3, Episode 3
...scientifically valid protocol that will make our lives better?

The Big Bang Theory Season 8, Episode 21
That's actually a valid example.

The Big Bang Theory Season 10, Episode 4
You know, if this experiment is going to be valid, I suggest a neutral environment.