Try Valentine's Day assemblies, songs, stories and visual stimuli for key stage 1 (P1-3) that explore how we show love from nickygal. For valentine cards, lbrowne describes how to decorate and create a card for someone special.
Explaining scientific concepts can be tricky because they are abstract ideas that many younger children find hard to assimilate. "Materials" is a helpful video from Teachers TV, with four ideas for practical science lessons using everyday equipment and ingredients.
Whizz Education has produced a Curriculum for Excellence-aligned Maths- Whizz program online. Divided into a teachers' area and a tutoring area that pupils can work in at home, it contains lesson plans, investigation ideas and resources, as well as a window to track pupils' progress.