The article seems to se saying that liquid mirror telescopes could be made of other kinds of liquids too, especially on the moon, as mercury would freeze there. I just can't believe that the ones made from mercury are legal. I mean, would they build a telescope using lead? Mercury is the most toxic non-radioactive substance on earth and these people seem to think it's no big deal for huge vats of it to be sitting around. A little amalgam would be a drop in the ocean.

A thorough medical exam of the people who build and use these telescopes would be revealing, I think. Let's hope none of the vats gets tipped over, cracked, etc.