Valentine-themed science to create excitement about sinking and floating. Get the complete grade-level series for a bundle discount. Explores density, buoyancy, and how life jackets work. Aligned to NGSS. Jam-packed with an investigation, station ideas, exploration challenge, and STEM challenge using simple supplies. Perfect for the multi-grade level teacher.Please note this experiment works best with the classic Necco Sweethearts which are now sold by SpanglerCandy or Brach's Tiny Conversation