visitors this year: 2,828 The very popular, but hardly-known Xiaomi nightlight, which lights up a dark space when you pass, now has a ‘smart’ version. A night light is nice on a dark stairway...
Most substances reflect some light and that is why we can see them. White light is a mixture of many colours mixed together. When white light shines on say, a blue fabric, the fabric reflects blue and absorbs every colour except blue. Similarly a red fabric reflects red and absorbs all other colours. A black fabric …
We need light to see things and light comes from something that is hot or burning. A torch or light bulb has tungsten wire which glows when hot. Candles produce light by burning chemicals. Some light ..
Roger Frost has been writing about technology since 1988 and this web includes articles; radio interviews with scientists and tutorials to use technology at home and the classroom.
rogerfrost.com is a compendium of ideas for using technology with sciencey questions in mind. Started in 1995 to offer ideas to school science teachers, Roger Frost expanded the coverage to home automation, lifestyle topics, handy gadgets and smarthome sensors to measure, or understand, what’s going on around him.
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