From the Bremen airport take the tramline 6 (towards "Universität") until the station "Domsheide".
From the Bremen main station take the tramline 4, 5, 6, 8 or the bus line 24, 25 (towards "Domsheide") until the station "Schüsselkorb".
From these stations you will find the Haus der Wissenschaft using the map shown on the right-hand seid of this page.
Address
Haus der Wissenschaft
Sandstraße 4/5
28195 Bremen
Phone: +49 421-218 69500
Fax: +49 421-218 69505