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Last Updated: Tuesday November 27 2007 11:00 GMT

What cool thing would you invent?

A soldier cutting invention
A device to cut soldiers for a boiled egg

The best young inventors in the country are being rewarded at the Cracking Ideas show.

The top ideas this year include a hat to keep you awake when doing homework and a machine that walks and feeds dogs so you don't have to!

But what great thing would you invent?

  • A machine that does your homework for you?
  • A gadget that makes you invisible?
  • Or a time travel machine so you could join The Doctor on his adventures?

Unfortunately this topic is now closed but there are Comments pages on other subjects on the main Chat index.

Your Comments

"I would make a flying chair that would fly you to school and back everyday. That would be really fun!"

Zoe, 10, Harrogate, England

"I would make a potion to stop mums nagging."

Lloyd, 9, South Ayrshire, Scotland

"I would make a girls-only alarm and put it on the TV so my brother couldn't watch it."

Lauren, 10, Nicosia, Cyprus

"I would invent a portable lie detection machine. Perfect for pranks."

Jose, 12, Lima, Peru

"If I could invent anything, I'd invent a device that stops adults from talking. If they started to shout I'd point it at them and make life bliss."

Kerri, 13, Newry, Northern Ireland

"I would invent a pair of really cute shoes that would grow with my feet."

Katie, 11, Chagrin Falls, USA

"I would invent a friend maker. If you were lonely you could ask it to make a friend for you and out of its chute it would make a completely new person for you to play with."

Paige, 8, Barrow, England

"If I was super smart I would invent a speed limit sign that wouldn't let you go past the speed limit, even if you floor it."

Callum, 12, Doncaster, England

"I would make a robot that could do all my schoolwork and all my homework!"

Alexander, 10, Wellingborough, England

"I would invent a school with no homework and lessons - just lessons on how to eat chocolate and cool stuff!"

Ellie, 10, Plymouth, England

"If I had to invent a "cool thing" I'd invent something so unique to the others, well I would make a machine that cures diseases. It would not only help patients, but doctors too."

Lauren, 11, Wolverhampton, England

"I would invent a dream recorder so that in the morning I could watch my dreams from the night before."

Jasmine, 11, Lancaster, England

"My invention is a robotic hand and you insert anyone's blood or DNA into the machine and it writes in their handwriting! Ideal for prank Valentine letters!"

Sam, 11 and 3/4, Orkney, Scotland

"My invention is a vacuum that lasers out all the dust and puts your room back to its normal state. Then you attach a plug to a computer and you can make your own background for your room. Once you have made your background you save it onto the vacuum and you press a button that changes your room."

Claire, 10, Clapham, England

"I want a machine that does my homework please. I have homework and I hate it. I'd give my left hand for no homework."

Jordan, 10, Carmarthenshire, Wales

"I would invent a robot that would tidy up my bedroom."

Alex, 6, Worcester, England

"I would invent something that makes vegetables taste good, because I hate them a lot."

Jade, 12, Wycombe, England

"I would invent a gadget that looks like a small game, but when you press a button it turns into a car, then a motorbike, then a submarine, then a bungalow."

Meryam, 11, Slough, England

"I would have a robot that helped me in school but is invisible!"

Sophia, 11, Miami State, USA

"I'd like to invent a robot that does what ever I tell him."

Rebecca, 10, Barnstaple, England

"We would love our homework to be done by a machine xx."

Kayleigh and Clara, 11, Belvedere, England

"I would love to invent a mini washing machine that would only wash my clothes!"

Rukhsar, 12, Slough, UK

"I would invent an outfit that could change to whatever I wanted it to be. So one minute I could be wearing trackies and then, if I saw someone I knew, I could press a button and change into a fab outfit!"

Emma, 12, Tottenham, England

"I'd like to invent high heel shoes that can change into comfy flat shoes at the touch of a button."

Newsround presenter Sonali