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If cells had a passport, mitochondria would be in it as the birthplace of energy. These tiny organelles are the body's true power plants. But what if they could be replaced, like a battery in a remote control? Scientists say you can. And it could be the key to prolonging youth.

Time is a strange substance. It stretches in a queue, flies on holiday, slows down in sadness and disappears in love. Someone considers it a resource, someone - an enemy, someone - a friend. In some cultures it is scheduled by the minute, in others it floats like a cloud in the sky.

Once it was science fiction to change a gene to defeat a disease or enhance intelligence. Today, it's a reality, and as The Economist writes, genetic engineering is already changing not just medicine but the very understanding of human beings.