0:00:06 > 0:00:08Hi, I'm Ayshah with your Sunday Newsround update.
0:00:08 > 0:00:09Coming up...
0:00:09 > 0:00:11Bronze for Bolt in his final solo race.
0:00:11 > 0:00:13The world's biggest heart goes on display.
0:00:13 > 0:00:18The little lamb who had a lucky break.
0:00:27 > 0:00:29Super sprinter Usain Bolt missed out on a gold medal
0:00:29 > 0:00:31in his last solo race at the World Championships
0:00:31 > 0:00:32last night.
0:00:32 > 0:00:36He started slowly out of the blocks and was challenged to the finish
0:00:36 > 0:00:37by American Justin Gatlin who took the gold.
0:00:37 > 0:00:40As the race ended Usain went to congratulate him on his win.
0:00:40 > 0:00:43It wasn't the end to Usain's career many were hoping for,
0:00:43 > 0:00:53but his position as a fantastic athlete is not in doubt.
0:00:54 > 0:00:55My start is killing me.
0:00:55 > 0:00:58It is just normally I would get better turnarounds but it
0:00:58 > 0:01:00didn't come together and that is what killed me.
0:01:00 > 0:01:03It didn't come together and I knew it didn't come together
0:01:03 > 0:01:04but I felt like it was there.
0:01:04 > 0:01:07The fact I didn't get it, that's why, that's the reason I lost,
0:01:07 > 0:01:09but it's just one of those things.
0:01:09 > 0:01:15Gold medal winner Justin Gatlin said it meant a lot to win the race.
0:01:15 > 0:01:18It is still an amazing night because it is Usain Bolt's last race.
0:01:18 > 0:01:22I had so many victories in so many losses and to be able to have run
0:01:22 > 0:01:25against him throughout the years, it is an amazing night.
0:01:25 > 0:01:29Next, there are more than 11 million people in the UK with some
0:01:29 > 0:01:30form of hearing loss.
0:01:30 > 0:01:32These deaf children have been telling the BBC how they'd
0:01:32 > 0:01:39like hearing people to treat them.
0:02:39 > 0:02:41The largest heart ever seen has gone on display
0:02:41 > 0:02:46at Toronto's Royal Ontario Museum.
0:02:46 > 0:02:50It belonged to a blue whale whose body had washed up on a river bank
0:02:50 > 0:02:51in Canada three years ago.
0:02:51 > 0:02:53The organ is almost as big as a person
0:02:53 > 0:02:56and would have weighed at least 181 kilograms before it was removed.
0:02:56 > 0:02:58It's been helping scientists understand more about
0:02:58 > 0:02:59the blue whale's body.
0:02:59 > 0:03:02The blue whale is the biggest species of animal that has
0:03:02 > 0:03:06ever lived on earth, bigger than any dinosaur.
0:03:06 > 0:03:09Most of the time, blue whale carcasses actually sink because blue
0:03:09 > 0:03:11whales don't have as much fat or blubber as other
0:03:11 > 0:03:15species of whale.
0:03:15 > 0:03:17This is the first and only blue whale heart.
0:03:17 > 0:03:19We are getting precise measurements that people were just sort
0:03:19 > 0:03:24of estimating before.
0:03:24 > 0:03:27YouTuber, singer and Dance Moms star JoJo Siwa has been busy
0:03:27 > 0:03:31answering your brilliant questions.
0:03:31 > 0:03:34Hey, everyone, it's JoJo, and I'm so excited because you guys
0:03:34 > 0:03:38sent me your questions.
0:03:38 > 0:03:41I'm hanging out with Newsround and I'm about to answer your
0:03:41 > 0:03:42questions right now.
0:03:42 > 0:03:43Let's do it.
0:03:43 > 0:03:44Hi, JoJo.
0:03:44 > 0:03:45Our question is...
0:03:46 > 0:03:51PS we are your biggest fans.
0:03:51 > 0:03:57What inspired me to start JoJo bows?
0:03:57 > 0:04:01I just love them and they are my thing and I love hair bows.
0:04:01 > 0:04:04I wanted these to mean something.
0:04:04 > 0:04:07So now if you wear one, you're someone who is nice, so it
0:04:07 > 0:04:09really has a good positive message.
0:04:09 > 0:04:18I'm so happy all of you guys are loving it.
0:04:18 > 0:04:19High Win-combe?
0:04:19 > 0:04:23She lives in High Wycombe.
0:04:23 > 0:04:26I think I would definitely be a doctor, I'd be a surgeon.
0:04:26 > 0:04:27Hi, JoJo.
0:04:27 > 0:04:30Jeans or leggings or a little shorts and then I would say acute T-shirt
0:04:30 > 0:04:34but it has all got to be black, pink and teal or purple
0:04:34 > 0:04:37or lime green.
0:04:37 > 0:04:39Oh, and of course a bow.
0:04:39 > 0:04:41How could I forget?
0:04:41 > 0:04:45I would like to know...
0:04:45 > 0:04:46I'd definitely bring my phone.
0:04:46 > 0:04:51An unlimited supply of water.
0:04:51 > 0:04:55What else?
0:04:55 > 0:04:56I don't know.
0:04:56 > 0:04:57Let's say rotisserie chicken.
0:04:57 > 0:04:58Hi, JoJo.
0:04:58 > 0:05:02I go dancing.
0:05:02 > 0:05:04I'm going to give you some advice.
0:05:04 > 0:05:07I told myself this about two months ago and my life has
0:05:07 > 0:05:08been great ever since.
0:05:08 > 0:05:10I am done being nervous.
0:05:10 > 0:05:12I live my life to the fullest.
0:05:12 > 0:05:14What is going to happen, are you going to mess up?
0:05:14 > 0:05:17Probably not but if you do it is OK.
0:05:17 > 0:05:19Honestly, you know your dance, you practice, you have worked hard,
0:05:19 > 0:05:24just go out and have fun.
0:05:24 > 0:05:26Next to the nine-year-old boy who got in touch with Nasa
0:05:26 > 0:05:28about a job they recently posted.
0:05:28 > 0:05:30The space agency are looking for a Planetary Protection Officer.
0:05:30 > 0:05:34In a letter Jack from New Jersey in America said, "I may be nine,
0:05:34 > 0:05:36but I think I would be perfect for the job."
0:05:36 > 0:05:39While Jack didn't get the position he did get a reply saying,
0:05:39 > 0:05:47"We hope to see you here at Nasa one of these days."
0:05:47 > 0:05:50Take a look at this lucky lamb who was rescued
0:05:50 > 0:05:51after hurting her leg.
0:05:51 > 0:05:53Sean Landy found Lily the lamb shivering in a hedge
0:05:53 > 0:05:54near his farm last week.
0:05:54 > 0:05:57She's now moved in with the sheepdogs in the kitchen.
0:05:57 > 0:05:59That's all from me, Newsround's back just after two.
0:05:59 > 0:06:00See you then.