:00:00. > :00:11.It's Nel here with the latest on Newsround. First up, are politicians
:00:12. > :00:13.behaving childishly? The Prime Minister David Cameron and the
:00:14. > :00:17.Leader of the Opposition Ed Miliband have been insulting each other in
:00:18. > :00:25.Parliament today. First, Ed Miliband called David Cameron a dunce - which
:00:26. > :00:35.means stupid. It is a maths, not so much there will of Wall Street, more
:00:36. > :00:40.they dunce of Downing Street. Then the Prime Minister called the leader
:00:41. > :00:47.of the opposition a Muppet! A lecture from anyone in the country
:00:48. > :00:52.but not from the two Muppets who advised the last Chancellor. You've
:00:53. > :00:55.been telling us whether you think it's childish for politicians to
:00:56. > :00:59.insult each other, or whether it's all part of the debate. And most of
:01:00. > :01:02.you don't like the name calling. AB-raan in County Tyrone, says it's
:01:03. > :01:05.not acceptable - while Trinity in Swindon says it's childish - they're
:01:06. > :01:09.adults and should be better role models for kids. So how does this
:01:10. > :01:16.sort of thing affect the image of Parliament? Every week the Prime
:01:17. > :01:23.Minister comes here to Parliament to answer questions. Often it can be
:01:24. > :01:30.really rowdy and noisy. Some people say that politicians should grow
:01:31. > :01:38.up. But others say it is fine and it is important for our leaders to be
:01:39. > :01:42.insulted. The reference to the Muppets has happened before. We're
:01:43. > :01:47.back in the 1970s, the then Prime Minister was compared to Kermit the
:01:48. > :01:50.frog. Next - an exciting discovery in
:01:51. > :01:53.Saudi Arabia suggests that the scorching hot deserts there used to
:01:54. > :01:57.be covered in lush grassy land, where large animals roamed. A team
:01:58. > :02:00.of scientists has dug up a huge tusk that's 300,000 years old - recent
:02:01. > :02:04.enough for humans to have been walking the Earth at the time.
:02:05. > :02:08.Here's the BBC's Frank Gardner to explain more. When you think of the
:02:09. > :02:16.Arabian desert you think of the Sun, the heat and dust. It didn't
:02:17. > :02:22.used to be like that. A team from Oxford and Saudi Arabia scientists
:02:23. > :02:36.found a massive elephant task from 300,000 years ago. -- tusk. Much of
:02:37. > :02:39.Arabia then was covered in jungle and there were herds of wild animals
:02:40. > :02:43.roaming around there long before it turned into a desert. This is
:02:44. > :02:48.changing the way everyone is thinking of climate change. It turns
:02:49. > :02:52.out it wasn't always desert and it used to be different. Early man had
:02:53. > :02:56.stone tools and were living alongside these animals.
:02:57. > :03:00.That's all from me, Newsround's back in the morning.