From clouds to crowds - four amateur scientists have  been chosen by BBC Radio 4 to turn their ideas into real-life  experiments.
The finalists were revealed this week on Material  World, the station's weekly science programme. 
The ideas include  testing whether there is more room at the front of music gigs than  further back and looking at how people present themselves on Facebook. 
The  amateurs will be mentored by leading scientists in their fields. 
The  four finalists are: 
- Ruth Brooks, 59, a retired home tutor from Devon, who wants to discover the homing distance of the garden snail so she can stop them from eating her petunias
- Sam O'kell, 35, a croupier from Cheshire; he will test his theory that there is more room at the front of music gigs than further back
- Nina Jones, 17, a student from Buckinghamshire, who will look at how people of different ages present themselves online through their Facebook photos
- John Rowlands, 41, an amateur astronomer from North Wales; he wants to research the frequency of noctilucent clouds, luminous layers of ice crystals that form high in the atmosphere.
The  talent search So You Want to Be a Scientist? was launched in January,  and more than 1,300 ideas were sent in.
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The four finalists were chosen by a panel of judges chaired by  Professor Lord Robert May, former chief science advisor to the  government. 
He was joined by clinical psychologist Professor  Tanya Byron, acoustics engineer Professor Trevor Cox, and Mark  Henderson, science editor of the London Times newspaper. 
"The  shortlist was amazing, I was overwhelmed," said Professor Byron. 
"They  were so creative and diverse, so it was really hard to make a  decision." 
Scientific statement
After agreeing on  the first three finalists, the judges almost reached a stalemate on the  final place. 
It was a close call between John Rowlands' study of  noctilucent clouds, and an entry by art gallery owner Shane Record from  Kent.
| The final selection proved tough work for the  judges | 
Shane wanted to test his observation that more people come into his  gallery when he puts a mannequin by the artwork. 
Giving the  illusion that they will not be alone in the gallery, says Shane, makes  visitors far more likely to enter. 
In the end, they chose John  Rowlands' amateur astronomy experiment, which had wider implications for  research fields such as climate change. 
It is thought that the  increase in brightness and frequency of noctilucent clouds over past  decades may be linked to global warming. 
The amateurs will be  mentored by leading scientists in their chosen field, who will advise  them on how to turn their ideas into rigorous experiments. 
From  anecdote to experiment
Professor Cox said the finalists had a  difficult task ahead of them. 
"I think the devil is in the  detail with science, it's really tough getting the methodology right so  you can get to an answer that's reliable." 
The four finalists  will present their results at the British Science Festival in Birmingham  in September, where the judges will pick a winner. 
They will  then write their results into a research paper and submit it to an  academic journal. 
Mark Henderson said that watching the  finalists' progress would give people a new insight into the world of  science. 
"Science is about having ideas, then gathering the  evidence to support your hypothesis. 
"I really hope that by  following these experiments people will be able to see how science is  really done." 
To hear more about the finalists and the judges'  meeting, readers in the UK can listen again to Material World on                 
 

 
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