Mind Games Contest #1 My entry

I would put only one red marble on the first bowl and the other 99 in the second. Then when I'm blindfolded I would recognise the light one and choose it. Then I will be 100% sure that the marble I will pick is the red one that I put there alone. And that's how I get to live.

The murderer had his legs intubated and dan ran the marathon. so dan is innoscent.
Jack is the brother of the murderer so he is innoscent.
Ben met Jack six months ago so he is not Jack's brother which mean he is innoscent since the murderer grew up with Jack.
Mike moved to the city lately and he considere being a farmer so he didn't grow up in Seattle with Jack. Which means he is not the murderer.
The only one suspect left is Jeff. He also wants to install ben's computer but ben can build coputers and this is another reason to susperct him.

The first step is to get the chiken to the other side. Now he is with the chiken in one side and the fox is with the corn in the other which is safe. Second he leaves the chiken and goes back alone to the first side. Then He gets the fox and goes to the chiken's side. Now he is with the chiken and the fox in one side, which is safe because he is with them, and the corn is in one side. After that, he takes the chiken back and leaves the fox alone. Now he is with the chiken and the corn in one side and the fos is in the other. Then he leaves the chiken in the first side and takes the corn to the fox's side. Now all hes has to de is to leave the fox and the corn there, which is safe, and go alone to the first side were he left the chiken alone. Finaly he takes the chiken and goes to the other side and he has them all across the river.
PS: it is also possible if you get the corn instead of the fox in the second step.