What is this liquid here?

Unicorn blood

It has the properties of mercury. My father had a ceramic jug full when I was a kid. Not knowing how toxic it really is, I used to play with it. I loved how it "exploded" into tiny balls when dropped on the cement basement floor. My parents were neither attentive, nor protective.

It is probably gallium in liquid form. It’s the only other metal similar to mercury but is non-toxic

T-1000 . . . Run!!!

Mercury Is he touching that without gloves?

Looks like Gallium to me. It might also be Mercury but if so, I hope you are using a fume hood/extractor and a/or a protective mask, Mercury vapors are toxic.

Hope it isn't Mercury the way the person is handling it.

The densest liquid. Mercury. Also called quicksilver.

I’d def guess mercury