Are there any alternatives to the soon-to-perish science research site "Scirus"?

Quoted from thei site: “We are sad to say goodbye
Scirus is set to retire near the end of January, 2014.

To ensure a smooth transition, we are informing you now so that you have sufficient time to find an alternative search solution for science-specific content.

Thank you for being a devoted user of Scirus. We have enjoyed serving you.”

This is a disaster! Why?
Can anyone else help as they can?