Answers
1) What’s the hardest know substance?
a) Diamond b) Water c) ADNR
Answer c) ADNR
In 2005, scientists at Bayreuth University in Germany created a new material by compressing pure carbon under extreme heat. Called hyper-diamond or aggregated diamond nanorods (ADNR). It’s the hardest, stiffest and densest substance known to science (although it looks rather like a glittery black pudding).
2) What is paper money made from?
‘Paper money’ is made from cotton or linen (confusingly, this is sometimes called ‘rag paper’). Cotton and linen fibres contain far fewer acids than wood pulp, so they don’t discolour or wear out so easily. In 1988, Australia became the first country to introduce bank notes made of plastic. These make it easier to incorporate security devices such as holograms.
3) Which part of the food does a microwave cook first?
a) the middle b) the outside c) both simultaneously
Answer b)
Microwave ovens don’t directly cook food; they heat the water inside it. If the food is the same consistency – all the way through – the water nearest the surface will absorb most of the energy. But food like jacket potatoes, which are dry on the outside, gets hotter in the centre, because the centre contains more water than the skin.