Question

what it osbthe correct form of brain​

Answer 1

If I talk about one person's brain , I use singular and for more than person's brain I use the plural,righ?

For example,

1.Use your brain.

2.He killed people and ate their brains.

So, in these two cases, we mean the organ inside our skull and the organs can be counted- so we should use singular/plural numbers.

But when we say "Beauty with Brains", obviously we do not mean a lady with more than one of that organ , we mean "intelligence" by "brain" here,right, and "intelligence" cannot be counted.

Now, here is the problem that encountered: "We need to put our brain to work to make sure it stays fit for long."