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Former South African leader Nelson Mandela is in a stable condition, his granddaughter says, though he remains critical. Ndileka Mandela said the 94-year-old's family were taking comfort from messages of support from the public. Meanwhile his daughter Makaziwe said he was "still there" and responding to touch. South Africa's first black president has been in hospital since 8 June with a lung infection. His health has worsened in recent days, prompting current President Jacob Zuma to cancel a foreign visit. He has now arrived back at the hospital. Emotional crowds continue to gather outside the Pretoria hospital. They have been adding messages of support for Mr Mandela, known by his clan name Madiba. Correspondents say South Africans now seem resigned to the prospect of his death.

*.1918Born in the Eastern Cape *.1944Joins African National Congress *.1956Charged with high treason, but charges dropped *.1962Arrested, convicted of sabotage, sentenced to five years in prison *.1964Charged again, sentenced to life *.1990Freed from prison *.1993Wins Nobel Peace Prize *.1994Elected first black president *.1999Steps down as leader

We always see this network mast everywhere but have you ever wonder what work they do for us? Your mobile phone's network is working away in the background every time you update your Facebook status, make a call or send a text. Our network delivers billions of voice calls, messages and megabytes of data every year, and we understand that all of that communication is important to you.  So we take network matters seriously . How do I get coverage? Mobile phone networks are made up of thousands of masts, which are located all over the UK. At the top of each mast, there's an antenna. This is the part that sends and receives signals. Each antenna creates an area of coverage between 100 metres and 10 kilometres. The most powerful antennas are called macrocells, and they're located on tall masts on top of buildings or in fields. They create a large area of coverage. Busy areas are boosted with smaller microcells, which are located inside things like road signs, flag...

How Big is Our Universe? The universe is a big, big place. But how big? And how do we know?  Throughout history, humans have used a variety of techniques and methods to help them answer the questions 'How far?' and 'How big?' Generations of explorers have looked deeper and deeper into the vast expanse of the universe. And the journey continues today, as new methods are used, and new discoveries are made. (To learn more about distance, visit How Big is Our Universe .)  In the third century B.C., Aristarchus of Samos asked the question 'How far away is the Moon?' He was able to measure the distance by looking at the shadow of the Earth on the Moon during a lunar eclipse.  It was Edmund Halley, famous for predicting the return of the comet that bears his name, who three centuries ago found a way to measure the distance to the Sun and to the planet Venus. He knew that the planet Venus would very rarely, every 121 years, pass directly between the Earth and ...

Teenage pregnancy is a rather frightening reality that can change your life in an instant. The good news is that teenage pregnancy is avoidable: By not having sex, you never risk getting pregnant. If you do decide to have sex, it's best to stay informed about what you can do to avoid unwanted pregnancy. This guide will help inform you . Steps 1 Don't give in to  peer pressure . Many teenagers can feel left behind when their friends start to have boyfriends, or start having sex. Those who have started to do these things early can often talk about it enough to make others feel left out. However, if you do stand your ground and wait until you know you are ready, you will be glad of it. It means you'll have waited for the right person and the right time. Everyone develops at different rates, both physically and mentally, so don't feel that you should be racing your peers for things like having sex and getting boyfriends. Many of your peer...