Magical Crystal Hedgehog Kits are perfect for learning and having tons of fun! Each DIY crystal kit gives you the experience of being a scientist, carrying out experiments! Easy to make these kits provide hours of fun for kids!
The Classic Drinking Bird is a dumb-looking bird with a felt-covered head and plastic feet who can't get its fill of water and keeps drinking. Except it's really a heat engine that keeps moving with only the energy from warming and cooling!