I am super confused right now: "Hydrogen is typically impossible to study in liquid form — it becomes a solid at -259°C (-434°F)"

And yet if you Google "liquid hydrogen", there are hundreds of articles about liquid hydrogen...

I'm no chemist but ?!?. What am I missing?

I think the issue is that helium does not become a solid at 0k at 1atm pressure while hydrogen does. So one needs to do these experiments under less than 1 atm pressure when working with hydrogen or higher temperatures which may then not result in a superfluid state?