Andrew Gabriel wrote:
In article ,
Dave writes:
I have just watched a prog on digital tv (Ideal world) and they were
demonstrating a drill set that can drill through wood, plaster, brick,
concrete, tiles, mild steel, cast iron and bricks. See www.idealworld.tv

They were saying that they were a tipped drill and the tip was
cryogenically frozen cobalt.

What does cryogenically frozen mean when it freezes at 1495°C?
Dunked in water, perhaps?

That was one point I could not understand. I always thought that liquid
nitrogen was the coldest, easily available thing to use.

Dave