Solar cells, or photovoltaic cells, convert energy from sunlight into electricity… but how? What principles lie behind this technology?
What would you say if scientists could show that brain activity to press a button occurred 7 seconds before you consciously made the decision to even do so ?
Is it possible to recreate the language of Stone Age man, spoken between 30,000 and 100,000 years ago? Some linguists believe it is.
How many of us have a foot a foot long ?
What are the origins of some of the measurements we use today.