Avsnitt 2

In the second episode of Superquark a documentary from the new BBC series Human Planet: Rivers. The rivers of our planet provide many of the essentials for life: fresh water, natural routes of communication and entertainment, but living on a river can be a risk, whether it is the Amazon or the Ganges. The dangerous and incredible life of those who live "of" the river . How many times in the countryside have we seen those extraordinary webs built by spiders in the bushes, to trap insects? Today researchers have understood that spider thread could be a very precious material, for many uses, because it has a resistance that no other material we have built has. It could, for example, replace the cartilage of the knees. And this prospect is now very close to clinical application . In the report by Barbara Bernardini. In less than a century, cyclists' performances have skyrocketed: from 23 km/h in 1914 to 40 km/h in 2009.