1. 2D and 3D Imaging 2. Proper Tissue Harvesting 3. Histology Techniques 4. Equipmentology 5. Harvesting and Presenting Images 6. Tissue Analysis 7. From Birth to Adulthood 8. Early Postnatal Rebuilding of Gut Mucosa 9. Adaptation to Solid Diet 10. Cell Changes 11. Proteins for Development and Function 12. Healthy Gut Patterns vs. Intrauterine Growth Retarded Gut 13. Effects of Different Feeds 14. Gut Microbial Life 15. Pathophysiology in the Gut 16. Inflammation 17. Bacterial, Viral, and Parasitic Infections