If you can’t answer the riddle, don’t feel bad. Metal conductors usually conduct electricity and heat. Usually, that’s true, but researchers at the Department of Energy’s Lawrence Berkeley ...

Metals with more free electrons, like copper or silver, are the best conductors - they ... graphite is an example of a non-metal which is a good electrical conductor. The centre of most pencils ...

If electric vehicles were lighter, they would also be more energy-efficient. Not surprisingly, this is a problem researchers ...