BBC Bitesize Science Activities: games and video lessons on many topics including seasons, living things, materials, etc. For early childhood/Year groups.
BBC Bitesize Science Activities: similar as previous site except for older year groups. Topics include body systems, classification, sound, electricity, etc.
DogoNews - Science: updates on student-friendly happenings in the scientific industries
NASA: National Aeronautics and Space Administration
Skeletons: collection of digital human and animals skeletons