Today in pictures: 18th July 2013

17 July 2013 Last updated at 08:48 BST

Today in pictures: 18th July 2013
Children in party hats with colourful balloons celebrating Nelson Mandela's birthday.
A group of children sing Happy Birthday to former South African president Nelson Mandela outside the Mediclinic Heart Hospital where he's being treated for a lung infection. The children's signs say 'Madiba', which is the name of the clan of which Mr Mandela is a member.
Bubba Watson walking with golf clubs.
A fun club cover on the bag of golfer Bubba Watson from the United States is seen during the first round of the 142nd Open Championship at Muirfield in Scotland.
A picture showing a red moon in the night sky.
A reddish moon is seen through the smoke in the western skies of California, USA, because of the mountain fire there. The blaze started on Monday afternoon near Los Angeles.
Fans posing in front of a comic mural.
Fans take a 'selfie' in front of a comics mural at the Comic-Con International 2013 event in San Diego, California.
Sir David Attenborough with a Great Mormon Butterfly on his nose.
Nature legend, Sir David Attenborough, poses with a Great Mormon Butterfly on his nose in 2012. He said the wet summer of 2012 was a "disaster" for butterflies and has called on the public to help assess if species were recovering from their worst year on record. UK butterfly numbers have reached record lows in gardens and the countryside, the charity Butterfly Conservation said today.
Two divers upside down.
Divers practise during a training session ahead of the FINA World Championships in Barcelona, Spain.
Cricketers playing on the first day of the second Ashes cricket test match
Australia's fielders appeal on the first day of the second Ashes cricket test match at Lord's cricket ground in London.
A girl enjoying the hot weather, surrounded by water fountains
The UK enjoyed the hottest day of the year so far on Wednesday - with 32.2C recorded in south-west London. The hot weather doesn't look like it's going anywhere soon. You guys are coming up with lots of different ways to cool down, like this girl who is playing in the fountain "Appearing Rooms", by Danish artist Jeppe Hein, in London. Remember to take care when playing near water and always let a parent or guardian know where you are.