Science History on Pitara Kids Network

Tree Rings tell many Tales

Thu, 30 May 2002 18:45:46 +0000

Examining ancient trees helps scientists get an amazing picture of Earth’s life, for trees are a record of their life time. By looking closely at the rings of a tree, scientists can not only tell how old it is; they can also tell you that in one summer in 1453 and again in 1601, there were freak cold spells.

Tree rings, when radiocarbon-dated give a glimpse of certain aspects of prehistoric times. But what is radiocarbon dating?

Scientists Find More on the Eureka Man

Thu, 29 Aug 2002 17:49:51 +0000

Why do ships float on water when in fact they should sink? Why does paper float on water and a paperweight sink? The answer to these questions was accidentally discovered 2200 years ago by the Greek inventor and mathematician, Archimedes.

One day, while getting into his bath he noticed water spilling over the sides. In a flash, Archimedes realised the relation between the water that had fallen out and the weight of his body – in other words he discovered why some objects float and some sink! Archimedes was so excited with his discovery that he hopped out of the bath, and rushed naked into the street yelling triumphantly, ‘Eureka!’ ‘Eureka!’ (Greek word for ‘I have found it!).

Excerpts from 'Everything has a History'

Thu, 26 Mar 1998 02:26:14 +0000

Haldane’s books are the best for communicating science to a layperson. He wrote almost 300 brilliant articles on popular science for ordinary workers, many of which were later collated into books such as ‘Everything has a History’, ‘Science in Everyday Life’ and ‘On Being the Right Size’. Here are two chapters from ‘Everything has a History’.

How Bees Communicate:

Eight years ago, I gave an account in ‘The Daily Worker’ of the early work of Von Frisch and others on the language of bees. In July 1947, I was at the London Zoo with Professor Hadorn of Zurich. We watched bees coming into the glass-fronted hive laden with pollen of different colours in the bags on their legs. He was able, by watching them, to tell me from what direction they had come, and roughly from what distance. So will you be, after reading this article.