The Czech Republic has been hit by extremely cold weather in the last week
or so. Some roads have been blocked by snow, border crossings closed and
flights have been delayed at Prague airport. One thing we haven't seen
here in Prague is something which used to happen often: the Vltava River
has not frozen over. That change is largely due to the building of a
series of weirs and dams downstream of the capital in the 1950s. The last
time it was possible to walk, or skate, across the Vltava was in 1978,
though the ice was not so thick then, and it