.hide-for-small.logo.center= image_tag '/images/sciencegist-logo-medium.png'
.show-for-small.logo.center= image_tag '/images/sciencegist-logo-small.png'

.hide-for-small.logo.center=link_to image_tag('/images/sciencegist-logo-medium.png'), root_url(subdomain: 'www')
.show-for-small.logo.center=link_to image_tag('/images/sciencegist-logo-small.png'), root_url(subdomain: 'www')

Make logo on blog link to home page
Make logo on blog link to home page

ScienceGist/sciencegist,ScienceGist/sciencegist