After a while, even the best and most carefully polished silver becomes dull and tarnished, and needs to be cleaned again. Why does it tarnish, and how can it be…
Originally, carpets and rugs were cleaned by lifting them, taking them outside, hanging them over a line and beating them with a carpet beater (a very dusty job), or by…
Ultraviolet (UV) light is an invisible part of light. It has a shorter wavelength than violet light (see ‘Making a Rainbow: Breaking Light Into Colour’), and its name means ‘beyond…
Stalactites and stalagmites are formations of rock in underground caves. They are formed when calcium carbonate and other minerals dissolve in water running through the soil and rocks. As the…
Some children take to science likes ducks to water, but others seem to just decide that they ‘don’t like science’, which might be because they are scared off by the…
Think about the best food ever – perhaps a really good piece of chocolate cake – and remember what it tastes like and what it smells like. And then imagine…
The colour of food is important – if an apple or a strawberry is red, it’s likely to be ripe, sweet and good to eat, and if a piece of…
People seem to remember many things by their colour – a red bus, their blue car, a friend’s house with a yellow door. An image in colour seems more vivid…
Before watches and clocks were invented, people used the position of the sun in the sky to guess the time of day, but this couldn’t be very accurate. The next…
