Canonball in Mercury

Have you ever felt the weight of a canonball? Even if you haven't, you can imagine it to be quite heavy, right?

But what if instead of throwing it to a pool filled with water, you'd throw it into a tank filled with mercury?

Check the result for yourself:



Yep, it floats!
Too bad mercury is considered a serious health hazard, I can't imagine how much fun it would be to plunge into a pool filled with mercury. :)

[update]
It didn't take long, a friend of mine quickly pointed me to this photo:

I suppose this was "before" mercury was considered bad for your health... :P