[ludston]

Nah you'll find that there actually is research done into which activities stimulate the brain the most. Some of the only things that stimulate all four hemispheres of the brain at the same time include sex or sight-reading and singing at the same time.

[simonh]

I'm not convinced that 'stimulating all four hemispheres of the brain' necessarily has anything whatever to do with improving learning ability and developing mental skills or critical thinking.