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Have you ever wondered where the ruby colour of red wine comes from? And did you know that some wine producers enhance the colour of wine even though they shouldn't? These questions arose during research conducted by scientists from the eastern town of Olomouc, which focuses on natural dyes called anthocyanins.

The majestic building of Prague's National Museum, standing on top of Wenceslas Square, opened in 1891 to provide a dignified home for the institution, founded in 1818. What was a quiet, leafy area a hundred years ago is now the busiest place in Prague. With congested motorways on both sides of the building and two metro lines crossing right underneath it the National Museum building is suffering considerably.

This week the news arrived from Iran that an expedition of young Czech geologists discovered what might be the largest salt cave in the world. The discovery was no accident. It was one of the aims of the expedition which left for southern Iran a couple of weeks ago. In today's Czech Science we will find out more about the goals of Expedition Namak 2006.

So-called "invasive" species include plants and animals that have been brought from other parts of the world and harm native species, sometimes to the point of extinction. In today's Czech Science we look at two such aliens in the Czech Republic, the giant hogweed and the American mink, and at what exactly science can do to help tackle the problem.

Some thirteen years ago the Czech National Library first started a pioneering project in which it turns rare documents into digital form. Its experts even devised a special format for the digitisation which was later adopted as a UNESCO standard. For its preservation efforts, the library was given a UNESCO award earlier this year. In this edition of Czech Science, we take you to the historic building of the Czech National Library in Prague where the oldest manuscripts meet with the most advanced technology.

Is life on Earth a product of "blind evolution" or is the world as we know it the work of an omnipotent creator? Hundreds of supporters of the theory of "intelligent design" gathered in Prague at the weekend to discuss, as they said "errors in Charles Darwin's theory of evolution and alternatives to it".

It's been more than three years since massive floods wreaked havoc in Prague. Although all the visible marks have been cleaned up and repaired in the city, the restoration work is far from finished: there are still tonnes and tonnes of paper documents from flooded archives waiting in refrigeration plants. In Czech Science today we visit one of the drying and rescue centres.

Ancient Egypt never ceases to fascinate people the world over. Czech Egyptology has an international reputation and its history goes back to the late 19th century when the Czech lands were part of the Austro-Hungarian Empire. Last week a conference in Prague looked at the links between Czech and Austrian Egyptology.

In Czech Science today we travel to the Northeast of England for a look at a successful example of Czech industrial design.

Last Friday was European Researchers' Night - an event involving a variety of science-oriented programmes for the public which ran late into the night. In Prague, one of the topics discussed was sleep.